package features;

public class SwitchExpressionsExample {
    public static void exec() {
        // 传统switch语句
        int day = 3;
        String dayType;
        switch (day) {
            case 1:
            case 2:
            case 3:
            case 4:
            case 5:
                dayType = "Weekday";
                break;
            case 6:
            case 7:
                dayType = "Weekend";
                break;
            default:
                dayType = "Invalid";
        }
        System.out.println("传统switch: " + dayType);
        
        // Java 13 switch表达式 (需要--enable-preview参数)
        String result = switch (day) {
            case 1, 2, 3, 4, 5 -> "Weekday";
            case 6, 7 -> "Weekend";
            default -> "Invalid";
        };
        System.out.println("Switch表达式: " + result);
        
        // 使用yield返回值 (需要--enable-preview参数)
        String dayName = switch (day) {
            case 1: yield "Monday";
            case 2: yield "Tuesday";
            case 3: yield "Wednesday";
            case 4: yield "Thursday";
            case 5: yield "Friday";
            case 6: yield "Saturday";
            case 7: yield "Sunday";
            default: yield "Invalid day";
        };
        System.out.println("Day name: " + dayName);
    }
}