From 83190d9a50676187d2b47c33ed8a50dfeb48c291 Mon Sep 17 00:00:00 2001 From: maxf Date: Wed, 13 Aug 2025 21:01:25 +0800 Subject: [PATCH] =?UTF-8?q?[update]=20java10-example=20=E7=A4=BA=E4=BE=8B?= =?UTF-8?q?=E5=AE=8C=E6=88=90?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- demo2/java10-example/AppCDS.md | 700 ++++++++++++++++++ demo2/java10-example/doc/img.png | Bin 0 -> 13118 bytes demo2/java10-example/doc/img_1.png | Bin 0 -> 7595 bytes demo2/java10-example/doc/img_2.png | Bin 0 -> 6278 bytes .../src/main/java/AppCDSExample.java | 27 - demo2/java10-example/src/main/java/Main.java | 13 + .../src/main/java/OtherFeaturesExample.java | 42 -- .../java/top/yexuejc/demo/java10/MyApp.java | 14 + 8 files changed, 727 insertions(+), 69 deletions(-) create mode 100644 demo2/java10-example/AppCDS.md create mode 100644 demo2/java10-example/doc/img.png create mode 100644 demo2/java10-example/doc/img_1.png create mode 100644 demo2/java10-example/doc/img_2.png delete mode 100644 demo2/java10-example/src/main/java/AppCDSExample.java delete mode 100644 demo2/java10-example/src/main/java/OtherFeaturesExample.java create mode 100644 demo2/java10-example/src/main/java/top/yexuejc/demo/java10/MyApp.java diff --git a/demo2/java10-example/AppCDS.md b/demo2/java10-example/AppCDS.md new file mode 100644 index 0000000..5f9ea1f --- /dev/null +++ b/demo2/java10-example/AppCDS.md @@ -0,0 +1,700 @@ +Java 10 新特性示例：应用类数据共享 (Application Class-Data Sharing) +--- +AppCDS 的使用需要通过 JVM 参数在命令行中进行操作，无法在单一 Java 程序内部完全展示。以下是完整的可运行示例说明： + +## 可运行示例说明 + +### 1. 创建一个简单的应用程序 + +```java +// MyApp.java +package top.yexuejc.demo.java10; +public class MyApp { + public static void main(String[] args) { + System.out.println("Hello from MyApp with AppCDS!"); + // 使用一些常用的类来演示类共享 + java.util.ArrayList list = new java.util.ArrayList<>(); + list.add("Example"); + System.out.println("List size: " + list.size()); + } +} + +``` + + +### 2. AppCDS 使用步骤 + +AppCDS 的使用分为三个步骤，需要在命令行中执行： + +1. **创建类列表文件**： + ```bash + # "C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -Xshare:off -XX:DumpLoadedClassList=app.classlist top.yexuejc.demo.java10.MyApp + java -Xshare:off -XX:DumpLoadedClassList=app.classlist top.yexuejc.demo.java10.MyApp + ``` + + 这会生成一个 `app.classlist` 文件，其中包含应用程序加载的所有类。 + ![img.png](doc/img.png) + ![img_1.png](doc/img_1.png) +2. **创建共享存档**： + ```bash + # "C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -XX:+UnlockDiagnosticVMOptions -Xshare:dump -XX:SharedClassListFile=app.classlist -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + java -Xshare:dump -XX:SharedClassListFile=app.classlist -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + ``` + 这会创建一个名为 `app.jsa` 的共享存档文件。 + ```shell + F:\coding\java-learning\demo2\java10-example\target\classes>"C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -Xshare:dump -XX:SharedClassListFile=app.classlist -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + Error: VM option 'SharedArchiveFile' is diagnostic and must be enabled via -XX:+UnlockDiagnosticVMOptions. + Error: The unlock option must precede 'SharedArchiveFile'. + Error: Could not create the Java Virtual Machine. + Error: A fatal exception has occurred. Program will exit. + + # 添加-XX:+UnlockDiagnosticVMOptions + + F:\coding\java-learning\demo2\java10-example\target\classes>"C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -XX:+UnlockDiagnosticVMOptions -Xshare:dump -XX:SharedClassListFile=app.classlist -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + narrow_klass_base = 0x0000000800000000, narrow_klass_shift = 3 + Allocated temporary class space: 1073741824 bytes at 0x00000008c0000000 + Allocated shared space: 3221225472 bytes at 0x0000000800000000 + Loading classes to share ... + Loading classes to share: done. + Rewriting and linking classes ... + Rewriting and linking classes: done + Number of classes 635 + instance classes = 572 + obj array classes = 55 + type array classes = 8 + Updating ConstMethods ... done. + Removing unshareable information ... done. + Scanning all metaspace objects ... + Allocating RW objects ... + Allocating RO objects ... + Relocating embedded pointers ... + Relocating external roots ... + Dumping symbol table ... + Relocating SystemDictionary::_well_known_klasses[] ... + Removing java_mirror ... done. + mc space: 5560 [ 0.1% of total] out of 65536 bytes [ 8.5% used] at 0x0000000800000000 + rw space: 2036632 [ 21.4% of total] out of 2097152 bytes [ 97.1% used] at 0x0000000800010000 + ro space: 3864664 [ 40.7% of total] out of 3866624 bytes [ 99.9% used] at 0x0000000800210000 + md space: 6160 [ 0.1% of total] out of 65536 bytes [ 9.4% used] at 0x00000008005c0000 + od space: 3356912 [ 35.3% of total] out of 3407872 bytes [ 98.5% used] at 0x00000008005d0000 + total : 9269928 [100.0% of total] out of 9502720 bytes [ 97.6% used] + + ``` + ![img_2.png](doc/img_2.png) + +3. **使用共享存档运行应用程序**： + ```bash + # "C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -XX:+UnlockDiagnosticVMOptions -Xshare:on -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + java -Xshare:on -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + ``` + ```shell + F:\coding\java-learning\demo2\java10-example\target\classes>"C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -XX:+UnlockDiagnosticVMOptions -Xshare:on -XX:SharedArchiveFile=app.jsa top.yexuejc.demo.java10.MyApp + Hello from MyApp with AppCDS! + List size: 1 + ``` + 这样运行的应用程序会使用共享存档，从而加快启动速度。 + +### 3. 验证 AppCDS 是否生效 + +可以通过以下方式验证 AppCDS 是否正常工作： + +```bash +# 检查是否使用了共享存档 +# "C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -XX:+UnlockDiagnosticVMOptions -Xshare:on -XX:SharedArchiveFile=app.jsa -verbose:class top.yexuejc.demo.java10.MyApp +java -Xshare:on -XX:SharedArchiveFile=app.jsa -verbose:class top.yexuejc.demo.java10.MyApp +``` +```shell +F:\coding\java-learning\demo2\java10-example\target\classes>"C:\Program Files\Java\jdk-10.0.2\bin\java.exe" -XX:+UnlockDiagnosticVMOptions -Xshare:on -XX:SharedArchiveFile=app.jsa -verbose:class top.yexuejc.demo.java10.MyApp +[0.010s][info][class,load] opened: C:\Program Files\Java\jdk-10.0.2\lib\modules +[0.032s][info][class,load] java.lang.Object 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+[0.071s][info][class,load] jdk.internal.reflect.NativeConstructorAccessorImpl source: shared objects file +[0.071s][info][class,load] jdk.internal.reflect.DelegatingConstructorAccessorImpl source: shared objects file +[0.071s][info][class,load] java.lang.StringCoding source: shared objects file +[0.071s][info][class,load] java.lang.StringCoding$1 source: shared objects file +[0.071s][info][class,load] java.lang.ThreadLocal$ThreadLocalMap source: shared objects file +[0.071s][info][class,load] java.lang.ThreadLocal$ThreadLocalMap$Entry source: shared objects file +[0.072s][info][class,load] java.lang.StringCoding$StringDecoder source: shared objects file +[0.072s][info][class,load] sun.nio.cs.DoubleByte source: shared objects file +[0.072s][info][class,load] java.lang.StringUTF16 source: shared objects file +[0.073s][info][class,load] java.nio.charset.CharsetDecoder source: shared objects file +[0.073s][info][class,load] sun.nio.cs.DelegatableDecoder source: shared objects file +[0.073s][info][class,load] sun.nio.cs.ArrayDecoder source: shared objects file +[0.073s][info][class,load] sun.nio.cs.DoubleByte$Decoder source: shared objects file +[0.074s][info][class,load] java.nio.charset.CodingErrorAction source: shared objects file +[0.074s][info][class,load] java.lang.StringCoding$Result source: shared objects file +[0.074s][info][class,load] java.util.Properties$EntrySet source: shared objects file +[0.074s][info][class,load] java.util.concurrent.ConcurrentHashMap$CollectionView source: shared objects file +[0.075s][info][class,load] java.util.concurrent.ConcurrentHashMap$EntrySetView source: shared objects file +[0.075s][info][class,load] java.util.Collections source: shared objects file +[0.075s][info][class,load] java.util.Collections$EmptySet source: shared objects file +[0.075s][info][class,load] java.util.List source: shared objects file +[0.075s][info][class,load] java.util.AbstractList source: shared objects file +[0.075s][info][class,load] java.util.RandomAccess source: shared objects file +[0.075s][info][class,load] java.util.Collections$EmptyList source: shared objects file +[0.076s][info][class,load] java.util.Collections$EmptyMap source: shared objects file +[0.076s][info][class,load] java.util.Collections$SynchronizedCollection source: shared objects file +[0.076s][info][class,load] java.util.Collections$SynchronizedSet source: shared objects file +[0.076s][info][class,load] java.lang.reflect.Array source: shared objects file +[0.076s][info][class,load] java.util.concurrent.ConcurrentHashMap$Traverser source: shared objects file +[0.076s][info][class,load] java.util.concurrent.ConcurrentHashMap$BaseIterator source: shared objects file +[0.076s][info][class,load] java.util.Iterator source: shared objects file +[0.076s][info][class,load] java.util.concurrent.ConcurrentHashMap$EntryIterator source: shared objects file +[0.076s][info][class,load] java.util.concurrent.ConcurrentHashMap$MapEntry source: shared objects file +[0.077s][info][class,load] java.util.ImmutableCollections$AbstractImmutableMap source: shared objects file +[0.077s][info][class,load] java.util.ImmutableCollections$MapN source: shared objects file +[0.077s][info][class,load] java.util.ImmutableCollections source: shared objects file +[0.077s][info][class,load] java.lang.VersionProps source: shared objects file +[0.077s][info][class,load] java.io.FileInputStream source: shared objects file +[0.078s][info][class,load] java.io.FileDescriptor source: shared objects file +[0.078s][info][class,load] jdk.internal.misc.JavaIOFileDescriptorAccess source: shared objects file +[0.078s][info][class,load] java.io.FileDescriptor$1 source: shared objects file +[0.078s][info][class,load] java.io.Flushable source: shared objects file +[0.078s][info][class,load] java.io.OutputStream source: shared objects file +[0.078s][info][class,load] java.io.FileOutputStream source: shared objects file +[0.078s][info][class,load] java.io.FilterInputStream source: shared objects file +[0.078s][info][class,load] java.io.BufferedInputStream source: shared objects file +[0.079s][info][class,load] java.io.FilterOutputStream source: shared objects file +[0.079s][info][class,load] java.io.PrintStream source: shared objects file +[0.079s][info][class,load] java.io.BufferedOutputStream source: shared objects file +[0.079s][info][class,load] java.lang.IllegalArgumentException source: shared objects file +[0.079s][info][class,load] java.nio.charset.UnsupportedCharsetException source: shared objects file +[0.080s][info][class,load] java.nio.charset.IllegalCharsetNameException source: shared objects file +[0.080s][info][class,load] java.io.IOException source: shared objects file +[0.080s][info][class,load] java.io.UnsupportedEncodingException source: shared objects file +[0.080s][info][class,load] java.io.Writer source: shared objects file +[0.080s][info][class,load] java.io.OutputStreamWriter source: shared objects file +[0.081s][info][class,load] sun.nio.cs.StreamEncoder source: shared objects file +[0.081s][info][class,load] sun.security.action.GetPropertyAction source: shared objects file +[0.081s][info][class,load] java.nio.charset.CharsetEncoder source: shared objects file +[0.082s][info][class,load] sun.nio.cs.ArrayEncoder source: shared objects file +[0.082s][info][class,load] sun.nio.cs.DoubleByte$Encoder source: shared objects file +[0.084s][info][class,load] java.nio.ByteBuffer source: shared objects file +[0.084s][info][class,load] java.nio.HeapByteBuffer source: shared objects file +[0.085s][info][class,load] java.nio.Bits source: shared objects file +[0.085s][info][class,load] java.nio.ByteOrder source: shared objects file +[0.085s][info][class,load] java.util.concurrent.atomic.AtomicLong source: shared objects file +[0.086s][info][class,load] jdk.internal.misc.JavaNioAccess source: shared objects file +[0.086s][info][class,load] java.nio.Bits$1 source: shared objects file +[0.086s][info][class,load] java.lang.Readable source: shared objects file +[0.086s][info][class,load] java.nio.CharBuffer source: shared objects file +[0.087s][info][class,load] java.nio.HeapCharBuffer source: shared objects file +[0.087s][info][class,load] java.nio.charset.CoderResult source: shared objects file +[0.087s][info][class,load] java.nio.charset.CoderResult$Cache source: shared objects file +[0.087s][info][class,load] java.nio.charset.CoderResult$1 source: shared objects file +[0.088s][info][class,load] java.nio.charset.CoderResult$2 source: shared objects file +[0.088s][info][class,load] java.io.BufferedWriter source: shared objects file +[0.089s][info][class,load] java.lang.Terminator source: shared objects file +[0.089s][info][class,load] jdk.internal.misc.Signal$Handler source: shared objects file +[0.089s][info][class,load] java.lang.Terminator$1 source: shared objects file +[0.089s][info][class,load] jdk.internal.misc.Signal source: shared objects file +[0.089s][info][class,load] java.util.Hashtable$Entry source: shared objects file +[0.090s][info][class,load] jdk.internal.misc.Signal$NativeHandler source: shared objects file +[0.090s][info][class,load] java.lang.Integer$IntegerCache source: shared objects file +[0.090s][info][class,load] jdk.internal.misc.OSEnvironment source: shared objects file +[0.090s][info][class,load] sun.io.Win32ErrorMode source: shared objects file +[0.090s][info][class,load] jdk.internal.misc.JavaLangAccess source: shared objects file +[0.091s][info][class,load] java.lang.System$2 source: shared objects file +[0.093s][info][class,load] java.lang.invoke.MethodHandleStatics source: shared objects file +[0.093s][info][class,load] java.lang.CharacterData source: shared objects file +[0.094s][info][class,load] java.lang.CharacterDataLatin1 source: shared objects file +[0.094s][info][class,load] jdk.internal.module.ModuleBootstrap source: shared objects file +[0.094s][info][class,load] java.lang.module.ModuleDescriptor source: shared objects file +[0.094s][info][class,load] jdk.internal.misc.JavaLangModuleAccess source: shared objects file +[0.095s][info][class,load] java.lang.module.ModuleDescriptor$1 source: shared objects file +[0.095s][info][class,load] java.io.DefaultFileSystem source: shared objects file +[0.095s][info][class,load] java.io.FileSystem source: shared objects file +[0.095s][info][class,load] java.io.WinNTFileSystem source: shared objects file +[0.096s][info][class,load] java.io.ExpiringCache source: shared objects file +[0.096s][info][class,load] java.util.LinkedHashMap source: shared objects file +[0.096s][info][class,load] java.io.ExpiringCache$1 source: shared objects file +[0.096s][info][class,load] jdk.internal.module.ModulePatcher source: shared objects file +[0.097s][info][class,load] jdk.internal.module.SystemModuleFinders source: shared objects file +[0.097s][info][class,load] java.net.URI source: shared objects file +[0.097s][info][class,load] jdk.internal.misc.JavaNetUriAccess source: shared objects file +[0.097s][info][class,load] java.net.URI$1 source: shared objects file +[0.098s][info][class,load] jdk.internal.module.SystemModulesMap source: shared objects file +[0.098s][info][class,load] jdk.internal.module.SystemModules source: shared objects file +[0.098s][info][class,load] jdk.internal.module.SystemModules$default source: shared objects file +[0.098s][info][class,load] jdk.internal.module.Builder source: shared objects file +[0.098s][info][class,load] java.lang.module.ModuleDescriptor$Requires source: shared objects file +[0.098s][info][class,load] java.util.ImmutableCollections$Set0 source: shared objects file +[0.099s][info][class,load] java.lang.module.ModuleDescriptor$Exports source: shared objects file +[0.099s][info][class,load] java.util.ImmutableCollections$SetN source: shared objects file +[0.099s][info][class,load] java.util.ImmutableCollections$Set2 source: shared objects file +[0.099s][info][class,load] java.lang.module.ModuleDescriptor$Opens source: shared objects file +[0.100s][info][class,load] java.lang.module.ModuleDescriptor$Provides source: shared objects file +[0.100s][info][class,load] java.util.ImmutableCollections$AbstractImmutableList source: shared objects file +[0.100s][info][class,load] java.util.ImmutableCollections$List1 source: shared objects file +[0.100s][info][class,load] java.lang.module.ModuleDescriptor$Version source: shared objects file +[0.100s][info][class,load] java.util.ArrayList source: shared objects file +[0.101s][info][class,load] java.lang.Enum source: shared objects file +[0.101s][info][class,load] java.lang.module.ModuleDescriptor$Modifier source: shared objects file +[0.101s][info][class,load] java.lang.module.ModuleDescriptor$Requires$Modifier source: shared objects file +[0.101s][info][class,load] java.util.ImmutableCollections$ListN source: shared objects file +[0.102s][info][class,load] java.util.ImmutableCollections$List2 source: shared objects file +[0.103s][info][class,load] jdk.internal.module.ModuleTarget source: shared objects file +[0.103s][info][class,load] jdk.internal.module.ModuleHashes source: shared objects file +[0.103s][info][class,load] jdk.internal.module.ModuleHashes$Builder source: shared objects file +[0.104s][info][class,load] java.util.LinkedHashMap$Entry source: shared objects file +[0.104s][info][class,load] java.util.HashMap$TreeNode source: shared objects file +[0.104s][info][class,load] java.util.Collections$UnmodifiableMap source: shared objects file +[0.104s][info][class,load] jdk.internal.module.ModuleResolution source: shared objects file +[0.104s][info][class,load] java.lang.module.ModuleReference source: shared objects file +[0.104s][info][class,load] java.util.function.Supplier source: shared objects file +[0.105s][info][class,load] jdk.internal.module.SystemModuleFinders$2 source: shared objects file +[0.105s][info][class,load] jdk.internal.module.ModuleReferenceImpl source: shared objects file +[0.105s][info][class,load] java.util.KeyValueHolder source: shared objects file +[0.105s][info][class,load] jdk.internal.module.ModuleHashes$HashSupplier source: shared objects file +[0.105s][info][class,load] jdk.internal.module.SystemModuleFinders$3 source: shared objects file +[0.105s][info][class,load] java.lang.module.ModuleFinder source: shared objects file +[0.106s][info][class,load] jdk.internal.module.SystemModuleFinders$SystemModuleFinder source: shared objects file +[0.106s][info][class,load] jdk.internal.module.ModuleBootstrap$Counters source: shared objects file +[0.106s][info][class,load] java.util.Optional source: shared objects file +[0.106s][info][class,load] jdk.internal.loader.BootLoader source: shared objects file +[0.107s][info][class,load] jdk.internal.module.ServicesCatalog source: shared objects file +[0.107s][info][class,load] jdk.internal.loader.AbstractClassLoaderValue source: shared objects file +[0.107s][info][class,load] jdk.internal.loader.ClassLoaderValue source: shared objects file +[0.107s][info][class,load] jdk.internal.loader.URLClassPath source: shared objects file +[0.107s][info][class,load] java.net.URLStreamHandlerFactory source: shared objects file +[0.107s][info][class,load] java.net.URL$DefaultFactory source: shared objects file +[0.108s][info][class,load] jdk.internal.misc.JavaNetURLAccess source: shared objects file +[0.108s][info][class,load] java.net.URL$3 source: shared objects file +[0.108s][info][class,load] java.util.Vector source: shared objects file +[0.108s][info][class,load] java.util.Stack source: shared objects file +[0.108s][info][class,load] java.io.File$PathStatus source: shared objects file +[0.109s][info][class,load] java.io.ExpiringCache$Entry source: shared objects file +[0.109s][info][class,load] java.net.URLStreamHandler source: shared objects file +[0.109s][info][class,load] sun.net.www.protocol.file.Handler source: shared objects file +[0.109s][info][class,load] jdk.internal.util.Preconditions source: shared objects file +[0.109s][info][class,load] jdk.internal.loader.ClassLoaders$BootClassLoader source: shared objects file +[0.110s][info][class,load] java.lang.ClassLoader$ParallelLoaders source: shared objects file +[0.110s][info][class,load] java.util.WeakHashMap source: shared objects file +[0.110s][info][class,load] java.util.WeakHashMap$Entry source: shared objects file +[0.110s][info][class,load] java.util.Collections$SetFromMap source: shared objects file +[0.110s][info][class,load] java.util.WeakHashMap$KeySet source: shared objects file +[0.111s][info][class,load] jdk.internal.misc.JavaSecurityAccess source: shared objects file +[0.111s][info][class,load] java.security.ProtectionDomain$JavaSecurityAccessImpl source: shared objects file +[0.111s][info][class,load] jdk.internal.misc.JavaSecurityProtectionDomainAccess source: shared objects file +[0.111s][info][class,load] java.security.ProtectionDomain$2 source: shared objects file +[0.111s][info][class,load] java.security.ProtectionDomain$Key source: shared objects file +[0.112s][info][class,load] java.security.Principal source: shared objects file +[0.112s][info][class,load] jdk.internal.loader.BuiltinClassLoader$LoadedModule source: shared objects file +[0.112s][info][class,load] sun.net.www.protocol.jrt.Handler source: shared objects file +[0.113s][info][class,load] java.util.ImmutableCollections$SetN$1 source: shared objects file +[0.113s][info][class,load] java.lang.module.Configuration source: shared objects file +[0.114s][info][class,load] java.lang.module.ResolvedModule source: shared objects file +[0.114s][info][class,load] java.util.AbstractMap$1 source: shared objects file +[0.114s][info][class,load] java.util.AbstractMap$1$1 source: shared objects file +[0.114s][info][class,load] java.util.ImmutableCollections$MapN$1 source: shared objects file +[0.114s][info][class,load] java.util.ImmutableCollections$MapN$1$1 source: shared objects file +[0.115s][info][class,load] java.util.Collections$1 source: shared objects file +[0.115s][info][class,load] java.util.ImmutableCollections$Set2$1 source: shared objects file +[0.115s][info][class,load] java.util.Collections$EmptyIterator source: shared objects file +[0.115s][info][class,load] jdk.internal.module.ModuleLoaderMap source: shared objects file +[0.116s][info][class,load] java.util.function.Function source: shared objects file +[0.116s][info][class,load] jdk.internal.module.ModuleLoaderMap$Mapper source: shared objects file +[0.117s][info][class,load] java.util.concurrent.ConcurrentHashMap$ForwardingNode source: shared objects file +[0.117s][info][class,load] java.lang.ModuleLayer source: shared objects file +[0.118s][info][class,load] java.util.ImmutableCollections$List0 source: shared objects file +[0.118s][info][class,load] java.util.AbstractList$Itr source: shared objects file +[0.118s][info][class,load] java.util.ArrayList$Itr source: shared objects file +[0.119s][info][class,load] java.util.Collections$UnmodifiableCollection source: shared objects file +[0.119s][info][class,load] java.util.Collections$UnmodifiableSet source: shared objects file +[0.120s][info][class,load] java.util.Collections$UnmodifiableCollection$1 source: shared objects file +[0.121s][info][class,load] jdk.internal.module.ServicesCatalog$ServiceProvider source: shared objects file +[0.121s][info][class,load] java.util.concurrent.CopyOnWriteArrayList source: shared objects file +[0.122s][info][class,load] java.util.HashMap$KeySet source: shared objects file +[0.122s][info][class,load] java.util.HashMap$HashIterator source: shared objects file +[0.122s][info][class,load] java.util.HashMap$KeyIterator source: shared objects file +[0.122s][info][class,load] java.lang.ModuleLayer$Controller source: shared objects file +[0.122s][info][class,load] jdk.internal.module.IllegalAccessLogger$Mode source: shared objects file +[0.123s][info][class,load] jdk.internal.module.IllegalAccessLogger$Builder source: shared objects file +[0.123s][info][class,load] java.util.HashMap$Values source: shared objects file +[0.123s][info][class,load] java.util.HashMap$ValueIterator source: shared objects file +[0.123s][info][class,load] jdk.internal.module.ModuleBootstrap$2 source: shared objects file +[0.124s][info][class,load] java.util.HashMap$EntrySet source: shared objects file +[0.124s][info][class,load] java.util.HashMap$EntryIterator source: shared objects file +[0.125s][info][class,load] jdk.internal.module.IllegalAccessLogger source: shared objects file +[0.126s][info][class,load] sun.launcher.LauncherHelper source: shared objects file +[0.126s][info][class,load] sun.net.util.URLUtil source: shared objects file +[0.126s][info][class,load] java.util.Locale source: shared objects file +[0.127s][info][class,load] sun.util.locale.LocaleObjectCache source: shared objects file +[0.127s][info][class,load] java.util.Locale$Cache source: shared objects file +[0.127s][info][class,load] sun.util.locale.BaseLocale source: shared objects file +[0.128s][info][class,load] sun.util.locale.BaseLocale$Cache source: shared objects file +[0.129s][info][class,load] sun.util.locale.BaseLocale$Key source: shared objects file +[0.129s][info][class,load] sun.util.locale.LocaleObjectCache$CacheEntry source: shared objects file +[0.129s][info][class,load] java.util.Locale$LocaleKey source: shared objects file +[0.129s][info][class,load] sun.util.locale.LocaleUtils source: shared objects file +[0.130s][info][class,load] sun.util.locale.InternalLocaleBuilder source: shared objects file +[0.130s][info][class,load] sun.util.locale.InternalLocaleBuilder$CaseInsensitiveChar source: shared objects file +[0.130s][info][class,load] java.security.PrivilegedExceptionAction source: shared objects file +[0.130s][info][class,load] jdk.internal.loader.URLClassPath$3 source: shared objects file +[0.130s][info][class,load] jdk.internal.loader.URLClassPath$Loader source: shared objects file +[0.131s][info][class,load] jdk.internal.loader.URLClassPath$FileLoader source: shared objects file +[0.131s][info][class,load] jdk.internal.loader.Resource source: shared objects file +[0.132s][info][class,load] jdk.internal.loader.URLClassPath$FileLoader$1 source: shared objects file +[0.132s][info][class,load] java.lang.NamedPackage source: shared objects file +[0.132s][info][class,load] java.lang.Package source: shared objects file +[0.132s][info][class,load] java.lang.Package$VersionInfo source: shared objects file +[0.132s][info][class,load] java.io.FileInputStream$AltFinalizer source: shared objects file +[0.132s][info][class,load] java.lang.ref.Cleaner$Cleanable source: shared objects file +[0.133s][info][class,load] jdk.internal.ref.PhantomCleanable source: shared objects file +[0.133s][info][class,load] java.io.FileDescriptor$FDCleanup source: shared objects file +[0.133s][info][class,load] jdk.internal.ref.CleanerFactory source: shared objects file +[0.133s][info][class,load] java.util.concurrent.ThreadFactory source: shared objects file +[0.133s][info][class,load] jdk.internal.ref.CleanerFactory$1 source: shared objects file +[0.133s][info][class,load] java.lang.ref.Cleaner source: shared objects file +[0.133s][info][class,load] java.lang.ref.Cleaner$1 source: shared objects file +[0.133s][info][class,load] jdk.internal.ref.CleanerImpl source: shared objects file +[0.133s][info][class,load] jdk.internal.ref.CleanerImpl$PhantomCleanableRef source: shared objects file +[0.134s][info][class,load] jdk.internal.ref.WeakCleanable source: shared objects file +[0.134s][info][class,load] jdk.internal.ref.CleanerImpl$WeakCleanableRef source: shared objects file +[0.134s][info][class,load] jdk.internal.ref.SoftCleanable source: shared objects file +[0.134s][info][class,load] jdk.internal.ref.CleanerImpl$SoftCleanableRef source: shared objects file +[0.134s][info][class,load] jdk.internal.ref.CleanerImpl$CleanerCleanable source: shared objects file +[0.134s][info][class,load] jdk.internal.ref.CleanerFactory$1$1 source: shared objects file +[0.134s][info][class,load] jdk.internal.misc.InnocuousThread source: shared objects file +[0.135s][info][class,load] jdk.internal.misc.InnocuousThread$3 source: shared objects file +[0.135s][info][class,load] jdk.internal.misc.InnocuousThread$2 source: shared objects file +[0.135s][info][class,load] sun.nio.ByteBuffered source: shared objects file +[0.135s][info][class,load] java.io.FileInputStream$1 source: shared objects file +[0.136s][info][class,load] java.security.SecureClassLoader$CodeSourceKey source: shared objects file +[0.136s][info][class,load] java.security.SecureClassLoader$1 source: shared objects file +[0.136s][info][class,load] java.util.concurrent.ConcurrentHashMap$ReservationNode source: shared objects file +[0.136s][info][class,load] java.security.PermissionCollection source: shared objects file +[0.136s][info][class,load] java.security.Permissions source: shared objects file +[0.136s][info][class,load] java.net.URLConnection source: shared objects file +[0.137s][info][class,load] sun.net.www.URLConnection source: shared objects file +[0.137s][info][class,load] sun.net.www.protocol.file.FileURLConnection source: shared objects file +[0.137s][info][class,load] sun.net.www.MessageHeader source: shared objects file +[0.137s][info][class,load] java.io.FilePermission source: shared objects file +[0.137s][info][class,load] sun.nio.fs.DefaultFileSystemProvider source: shared objects file +[0.138s][info][class,load] java.nio.file.spi.FileSystemProvider source: shared objects file +[0.138s][info][class,load] sun.nio.fs.AbstractFileSystemProvider source: shared objects file +[0.138s][info][class,load] sun.nio.fs.WindowsFileSystemProvider source: shared objects file +[0.138s][info][class,load] java.nio.file.FileSystem source: shared objects file +[0.138s][info][class,load] sun.nio.fs.WindowsFileSystem source: shared objects file +[0.138s][info][class,load] java.util.Arrays$ArrayList source: shared objects file +[0.138s][info][class,load] java.util.Arrays$ArrayItr source: shared objects file +[0.138s][info][class,load] sun.nio.fs.WindowsPathParser source: shared objects file +[0.139s][info][class,load] sun.nio.fs.WindowsPathType source: shared objects file +[0.139s][info][class,load] sun.nio.fs.WindowsPathParser$Result source: shared objects file +[0.139s][info][class,load] java.net.URI$Parser source: shared objects file +[0.139s][info][class,load] java.nio.file.Watchable source: shared objects file +[0.139s][info][class,load] java.nio.file.Path source: shared objects file +[0.139s][info][class,load] sun.nio.fs.WindowsPath source: shared objects file +[0.140s][info][class,load] jdk.internal.misc.JavaIOFilePermissionAccess source: shared objects file +[0.140s][info][class,load] java.io.FilePermission$1 source: shared objects file +[0.140s][info][class,load] sun.security.util.FilePermCompat source: shared objects file +[0.140s][info][class,load] java.security.Permissions$1 source: shared objects file +[0.140s][info][class,load] java.io.FilePermissionCollection source: shared objects file +[0.141s][info][class,load] java.util.function.BiFunction source: shared objects file +[0.141s][info][class,load] java.io.FilePermissionCollection$1 source: shared objects file +[0.141s][info][class,load] java.security.AllPermission source: shared objects file +[0.141s][info][class,load] java.security.UnresolvedPermission source: shared objects file +[0.141s][info][class,load] java.security.BasicPermissionCollection source: shared objects file +[0.141s][info][class,load] java.security.SecureClassLoader$DebugHolder source: shared objects file +[0.141s][info][class,load] sun.security.util.Debug source: shared objects file +[0.142s][info][class,load] top.yexuejc.demo.java10.MyApp source: file:/F:/coding/java-learning/demo2/java10-example/target/classes/ +[0.142s][info][class,load] java.lang.PublicMethods$MethodList source: shared objects file +[0.143s][info][class,load] java.lang.PublicMethods$Key source: shared objects file +[0.143s][info][class,load] java.lang.Void source: shared objects file +Hello from MyApp with AppCDS! +[0.143s][info][class,load] java.lang.invoke.StringConcatFactory source: shared objects file +[0.143s][info][class,load] java.lang.invoke.MethodHandles$Lookup source: shared objects file +[0.144s][info][class,load] java.lang.invoke.MethodType$ConcurrentWeakInternSet source: shared objects file +[0.144s][info][class,load] java.lang.invoke.MethodType$ConcurrentWeakInternSet$WeakEntry source: shared objects file +[0.144s][info][class,load] java.lang.invoke.MethodTypeForm source: shared objects file +[0.144s][info][class,load] java.lang.invoke.MethodHandles source: shared objects file +[0.145s][info][class,load] java.lang.invoke.MemberName$Factory source: shared objects file +[0.145s][info][class,load] sun.invoke.util.VerifyAccess source: shared objects file +[0.145s][info][class,load] sun.invoke.util.Wrapper source: shared objects file +[0.145s][info][class,load] sun.invoke.util.Wrapper$Format source: shared objects file +[0.146s][info][class,load] java.lang.invoke.LambdaForm$NamedFunction source: shared objects file +[0.146s][info][class,load] java.lang.invoke.DirectMethodHandle$Holder source: shared objects file +[0.146s][info][class,load] sun.invoke.util.ValueConversions source: shared objects file +[0.146s][info][class,load] java.lang.invoke.MethodHandleImpl source: shared objects file +[0.146s][info][class,load] java.lang.invoke.Invokers source: shared objects file +[0.147s][info][class,load] java.lang.invoke.StringConcatFactory$Strategy source: shared objects file +[0.147s][info][class,load] java.lang.invoke.LambdaForm$Kind source: shared objects file +[0.147s][info][class,load] java.lang.NoSuchMethodException source: shared objects file +[0.147s][info][class,load] java.lang.invoke.LambdaForm$BasicType source: shared objects file +[0.148s][info][class,load] java.lang.invoke.LambdaForm$Name source: shared objects file +[0.148s][info][class,load] java.lang.invoke.LambdaForm$Holder source: shared objects file +[0.148s][info][class,load] java.lang.invoke.MethodHandleImpl$Intrinsic source: shared objects file +[0.148s][info][class,load] java.lang.invoke.InvokerBytecodeGenerator source: shared objects file +[0.149s][info][class,load] java.lang.invoke.InvokerBytecodeGenerator$2 source: shared objects file +[0.149s][info][class,load] jdk.internal.misc.JavaLangInvokeAccess source: shared objects file +[0.149s][info][class,load] java.lang.invoke.MethodHandleImpl$1 source: shared objects file +[0.149s][info][class,load] java.lang.invoke.DelegatingMethodHandle source: shared objects file +[0.149s][info][class,load] java.lang.invoke.MethodHandleImpl$AsVarargsCollector source: shared objects file +[0.150s][info][class,load] java.lang.invoke.DelegatingMethodHandle$Holder source: shared objects file +[0.150s][info][class,load] java.lang.invoke.BoundMethodHandle source: shared objects file +[0.150s][info][class,load] java.lang.invoke.SimpleMethodHandle source: shared objects file +[0.150s][info][class,load] java.lang.invoke.Invokers$Holder source: shared objects file +[0.150s][info][class,load] java.lang.invoke.ClassSpecializer source: shared objects file +[0.151s][info][class,load] java.lang.invoke.BoundMethodHandle$Specializer source: shared objects file +[0.151s][info][class,load] java.lang.invoke.ClassSpecializer$SpeciesData source: shared objects file +[0.151s][info][class,load] java.lang.invoke.BoundMethodHandle$SpeciesData source: shared objects file +[0.151s][info][class,load] java.lang.invoke.ClassSpecializer$Factory source: shared objects file +[0.151s][info][class,load] java.lang.invoke.BoundMethodHandle$Specializer$Factory source: shared objects file +[0.151s][info][class,load] java.lang.invoke.ClassSpecializer$1 source: shared objects file +[0.152s][info][class,load] java.lang.NoSuchFieldException source: shared objects file +[0.152s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_L source: shared objects file +[0.152s][info][class,load] sun.invoke.util.VerifyType source: shared objects file +[0.153s][info][class,load] sun.invoke.empty.Empty source: shared objects file +[0.153s][info][class,load] java.lang.invoke.DirectMethodHandle$1 source: shared objects file +[0.153s][info][class,load] java.lang.invoke.DirectMethodHandle$Accessor source: shared objects file +[0.153s][info][class,load] java.lang.invoke.MethodHandleImpl$IntrinsicMethodHandle source: shared objects file +[0.154s][info][class,load] java.lang.invoke.LambdaFormEditor source: shared objects file +[0.154s][info][class,load] java.lang.invoke.LambdaFormEditor$Transform source: shared objects file +[0.154s][info][class,load] java.lang.invoke.LambdaFormBuffer source: shared objects file +[0.154s][info][class,load] jdk.internal.org.objectweb.asm.ClassVisitor source: shared objects file +[0.154s][info][class,load] jdk.internal.org.objectweb.asm.ClassWriter source: shared objects file +[0.155s][info][class,load] jdk.internal.org.objectweb.asm.ByteVector source: shared objects file +[0.155s][info][class,load] jdk.internal.org.objectweb.asm.Item source: shared objects file +[0.155s][info][class,load] sun.invoke.util.BytecodeDescriptor source: shared objects file +[0.155s][info][class,load] jdk.internal.org.objectweb.asm.MethodVisitor source: shared objects file +[0.155s][info][class,load] jdk.internal.org.objectweb.asm.MethodWriter source: shared objects file +[0.155s][info][class,load] jdk.internal.org.objectweb.asm.Type source: shared objects file +[0.155s][info][class,load] jdk.internal.org.objectweb.asm.Label source: shared objects file +[0.156s][info][class,load] jdk.internal.org.objectweb.asm.Frame source: shared objects file +[0.156s][info][class,load] jdk.internal.org.objectweb.asm.AnnotationVisitor source: shared objects file +[0.156s][info][class,load] jdk.internal.org.objectweb.asm.AnnotationWriter source: shared objects file +[0.157s][info][class,load] java.lang.invoke.InvokerBytecodeGenerator$CpPatch source: shared objects file +[0.157s][info][class,load] sun.reflect.misc.ReflectUtil source: shared objects file +[0.157s][info][class,load] java.lang.invoke.LambdaForm$MH/1421795058 source: java.lang.invoke.LambdaForm +[0.158s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LL source: shared objects file +[0.159s][info][class,load] java.lang.invoke.LambdaForm$MH/41359092 source: java.lang.invoke.LambdaForm +[0.160s][info][class,load] java.lang.invoke.LambdaForm$MH/149928006 source: java.lang.invoke.LambdaForm +[0.160s][info][class,load] java.lang.invoke.StringConcatFactory$1 source: shared objects file +[0.160s][info][class,load] java.lang.invoke.StringConcatFactory$Mode source: shared objects file +[0.160s][info][class,load] java.lang.invoke.StringConcatFactory$Recipe source: shared objects file +[0.161s][info][class,load] java.lang.invoke.StringConcatFactory$RecipeElement source: shared objects file +[0.161s][info][class,load] java.lang.invoke.StringConcatFactory$MethodHandleInlineCopyStrategy source: shared objects file +[0.161s][info][class,load] java.lang.invoke.StringConcatFactory$MethodHandleInlineCopyStrategy$1 source: shared objects file +[0.161s][info][class,load] java.lang.invoke.StringConcatFactory$MethodHandleInlineCopyStrategy$2 source: shared objects file +[0.162s][info][class,load] java.lang.invoke.StringConcatFactory$MethodHandleInlineCopyStrategy$3 source: shared objects file +[0.162s][info][class,load] java.lang.StringConcatHelper source: shared objects file +[0.162s][info][class,load] java.lang.invoke.StringConcatFactory$Stringifiers source: shared objects file +[0.163s][info][class,load] java.lang.ClassValue source: shared objects file +[0.163s][info][class,load] java.lang.invoke.StringConcatFactory$Stringifiers$StringifierMost source: shared objects file +[0.163s][info][class,load] java.lang.ClassValue$Entry source: shared objects file +[0.163s][info][class,load] java.lang.ClassValue$Identity source: shared objects file +[0.164s][info][class,load] java.lang.ClassValue$Version source: shared objects file +[0.164s][info][class,load] java.lang.invoke.StringConcatFactory$Stringifiers$StringifierAny source: shared objects file +[0.164s][info][class,load] java.lang.ClassValue$ClassValueMap source: shared objects file +[0.165s][info][class,load] java.lang.invoke.LambdaForm$MH/1160460865 source: java.lang.invoke.LambdaForm +[0.165s][info][class,load] java.lang.invoke.LambdaForm$MH/1247233941 source: java.lang.invoke.LambdaForm +[0.166s][info][class,load] java.lang.invoke.LambdaForm$MH/258952499 source: java.lang.invoke.LambdaForm +[0.167s][info][class,load] java.lang.invoke.LambdaForm$MH/603742814 source: java.lang.invoke.LambdaForm +[0.168s][info][class,load] java.lang.invoke.LambdaForm$MH/1067040082 source: java.lang.invoke.LambdaForm +[0.168s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LLL source: shared objects file +[0.169s][info][class,load] java.lang.invoke.LambdaForm$MH/980546781 source: java.lang.invoke.LambdaForm +[0.170s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LLLL source: shared objects file +[0.170s][info][class,load] java.lang.invoke.LambdaForm$MH/140435067 source: java.lang.invoke.LambdaForm +[0.172s][info][class,load] java.lang.invoke.LambdaForm$MH/1450495309 source: java.lang.invoke.LambdaForm +[0.172s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LLLLL source: shared objects file +[0.173s][info][class,load] java.lang.invoke.LambdaForm$MH/1706377736 source: java.lang.invoke.LambdaForm +[0.173s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LLLLLL source: shared objects file +[0.175s][info][class,load] java.lang.invoke.LambdaForm$MH/1804094807 source: java.lang.invoke.LambdaForm +[0.175s][info][class,load] java.lang.Byte$ByteCache source: shared objects file +[0.176s][info][class,load] java.lang.invoke.MethodHandles$1 source: shared objects file +[0.176s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LLLLLLI source: shared objects file +[0.177s][info][class,load] java.lang.invoke.LambdaForm$MH/2001049719 source: java.lang.invoke.LambdaForm +[0.178s][info][class,load] sun.invoke.util.ValueConversions$WrapperCache source: shared objects file +[0.178s][info][class,load] java.lang.invoke.BoundMethodHandle$Species_LLLLLLII source: shared objects file +[0.179s][info][class,load] java.lang.invoke.LambdaForm$MH/1927950199 source: java.lang.invoke.LambdaForm +[0.180s][info][class,load] java.lang.invoke.LambdaForm$MH/868693306 source: java.lang.invoke.LambdaForm +List size: 1 +[0.180s][info][class,load] java.lang.Shutdown source: shared objects file +[0.181s][info][class,load] java.lang.Shutdown$Lock source: shared objects file +``` diff --git a/demo2/java10-example/doc/img.png 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yf@4!KRbLwp;ra7*=B^JsCbj{cR3e9$Bplg2nk@8dw+a6*0Q9sC?^S3%jrcF0Kmzsv literal 0 HcmV?d00001 diff --git a/demo2/java10-example/src/main/java/AppCDSExample.java b/demo2/java10-example/src/main/java/AppCDSExample.java deleted file mode 100644 index d0381b4..0000000 --- a/demo2/java10-example/src/main/java/AppCDSExample.java +++ /dev/null @@ -1,27 +0,0 @@ -import java.util.*; - -/** - * Java 10 新特性示例：应用类数据共享 (Application Class-Data Sharing) - * - * AppCDS允许将应用程序类加载到共享存档中，以便在多个JVM进程间共享， - * 从而减少启动时间和内存占用。 - * - * 使用方法： - * 1. 创建类列表: java -Xshare:off -XX:DumpLoadedClassList=app.classlist com.example.MyApp - * 2. 创建共享存档: java -Xshare:dump -XX:SharedClassListFile=app.classlist -XX:SharedArchiveFile=app.jsa - * 3. 使用共享存档: java -Xshare:on -XX:SharedArchiveFile=app.jsa com.example.MyApp - */ -public class AppCDSExample { - public static void runExample() { - System.out.println("=== Java 10 应用类数据共享示例 ==="); - System.out.println("应用类数据共享(AppCDS)是Java 10的重要性能特性"); - System.out.println("它可以显著提高JVM启动速度并减少内存占用"); - System.out.println("特别适用于需要快速启动和运行多个JVM实例的场景"); - System.out.println(""); - System.out.println("使用步骤:"); - System.out.println("1. 创建类列表: java -Xshare:off -XX:DumpLoadedClassList=app.classlist MyApp"); - System.out.println("2. 创建共享存档: java -Xshare:dump -XX:SharedClassListFile=app.classlist -XX:SharedArchiveFile=app.jsa"); - System.out.println("3. 使用共享存档: java -Xshare:on -XX:SharedArchiveFile=app.jsa MyApp"); - System.out.println("\n=== 应用类数据共享示例结束 ===\n"); - } -} \ No newline at end of file diff --git a/demo2/java10-example/src/main/java/Main.java b/demo2/java10-example/src/main/java/Main.java index a465d82..259ea61 100644 --- a/demo2/java10-example/src/main/java/Main.java +++ b/demo2/java10-example/src/main/java/Main.java @@ -1,3 +1,6 @@ +import java.util.NoSuchElementException; +import java.util.Optional; + /** * Java 10 新特性主程序入口 * 演示Java 10的主要新特性 @@ -11,5 +14,15 @@ public class Main { // 运行局部变量类型推断示例 VarExample.runExample(); + + // Optional.orElseThrow() 简化调用 + Optional optional = Optional.empty(); + try { + // Java 10之前: optional.orElseThrow(NoSuchElementException::new) + // Java 10之后: optional.orElseThrow() - 无需显式指定异常构造器 + String result = optional.orElseThrow(); // 简化版本 + } catch (NoSuchElementException e) { + System.out.println("Optional为空，抛出异常: " + e.getMessage()); + } } } \ No newline at end of file diff --git a/demo2/java10-example/src/main/java/OtherFeaturesExample.java b/demo2/java10-example/src/main/java/OtherFeaturesExample.java deleted file mode 100644 index 19d8922..0000000 --- a/demo2/java10-example/src/main/java/OtherFeaturesExample.java +++ /dev/null @@ -1,42 +0,0 @@ -import java.util.*; -import java.util.stream.*; -import java.util.concurrent.*; - -/** - * Java 10 其他新特性示例 - * - * 包括API增强和其他重要改进 - */ -public class OtherFeaturesExample { - public static void runExample() { - System.out.println("=== Java 10 其他新特性示例 ==="); - - // Optional.orElseThrow() 简化调用 - Optional optional = Optional.empty(); - try { - // Java 10之前: optional.orElseThrow(NoSuchElementException::new) - // Java 10之后: optional.orElseThrow() - 无需显式指定异常构造器 - String result = optional.orElseThrow(); // 简化版本 - } catch (NoSuchElementException e) { - System.out.println("Optional为空，抛出异常: " + e.getMessage()); - } - - // Collection.toArray() 新重载方法 - List stringList = Arrays.asList("Java", "10", "新特性"); - // Java 10新增的重载方法，可以直接指定数组类型 -// String[] stringArray = stringList.toArray(stringList.toArray(new String[0])); - String[] stringArray = stringList.toArray(String[]::new); - System.out.println("Collection.toArray() 新方法结果: " + Arrays.toString(stringArray)); - - // Stream API 增强 - Collectors.teeing() - // 注意：teeing是在Java 12中引入的，这里演示其他collector的使用 - List numbers = Arrays.asList(1, 2, 3, 4, 5, 6, 7, 8, 9, 10); - - // 使用新的API改进 - var average = numbers.stream() - .collect(Collectors.averagingInt(Integer::intValue)); - System.out.println("数字平均值: " + average); - - System.out.println("\n=== 其他新特性示例结束 ===\n"); - } -} \ No newline at end of file diff --git a/demo2/java10-example/src/main/java/top/yexuejc/demo/java10/MyApp.java b/demo2/java10-example/src/main/java/top/yexuejc/demo/java10/MyApp.java new file mode 100644 index 0000000..19fbdc1 --- /dev/null +++ b/demo2/java10-example/src/main/java/top/yexuejc/demo/java10/MyApp.java @@ -0,0 +1,14 @@ +package top.yexuejc.demo.java10; +/** + * @author maxiaofeng + * @date 2025/8/13 20:40 + */ +public class MyApp { + public static void main(String[] args) { + System.out.println("Hello from MyApp with AppCDS!"); + // 使用一些常用的类来演示类共享 + java.util.ArrayList list = new java.util.ArrayList<>(); + list.add("Example"); + System.out.println("List size: " + list.size()); + } +}