单例延迟

最新推荐文章于 2024-02-05 01:47:22 发布

原创最新推荐文章于 2024-02-05 01:47:22 发布 · 134 阅读

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public class Single {
    private int id;

    private Single(){
        System.out.println("init.....");
    }
    private static class FooHolder {
        static final Single foo = new Single();
        static {
            foo.id=3;
            System.out.println("init id................");
        }
    }

    public static Single getFoo() {
        return FooHolder.foo;
    }

    public static void main(String[] args) throws Exception {
        Class.forName("Single");
        System.out.println("---------------");
        Single s=Single.getFoo();
        System.out.println("1111111111111111111111111");
    }
}