Java 17 in Browser

Main.java

public class Main {
    public static void main(String[] args) {
        // Java 17 新特性：文本块
        String json = """
            {
                "name": "CheerpJ",
                "version": "4.1",
                "java": 17
            }
            """;
        System.out.println("=== Java 17 Text Blocks ===");
        System.out.println(json);

// Java 17 新特性：switch 表达式
        String day = "MONDAY";
        int numLetters = switch (day) {
            case "MONDAY", "FRIDAY", "SUNDAY" -> 6;
            case "TUESDAY" -> 7;
            case "THURSDAY", "SATURDAY" -> 8;
            case "WEDNESDAY" -> 9;
            default -> throw new IllegalStateException("Invalid day: " + day);
        };
        System.out.println("\\n=== Java 17 Switch Expression ===");
        System.out.println(day + " has " + numLetters + " letters");

// Java 17 新特性：record
        record Point(int x, int y) {}
        Point p = new Point(3, 4);
        System.out.println("\\n=== Java 17 Record ===");
        System.out.println("Point: " + p);
        System.out.println("x = " + p.x() + ", y = " + p.y());

// 计算
        System.out.println("\\n=== Fibonacci ===");
        for (int i = 0; i < 10; i++) {
            System.out.print(fib(i) + " ");
        }
        System.out.println();
    }

static int fib(int n) {
        return n <= 1 ? n : fib(n - 1) + fib(n - 2);
    }
}

☕ Java 17 in Browser