java类加载执行顺序

Question

问题相关代码，请勿粘贴截图

static class Father {
    public static int a = 1;

    static {
        System.out.println("执行father static object a=" + a);
        a = 2;
    }

    {
        System.out.println("执行 father object a=" + a);
    }

    public Father() {
        System.out.println("执行 Father construct a=" + a);
        a = 6;
    }
}

static class Son extends Father {
    static {
        System.out.println("执行 Son static object a=" + a);
        a = 3;
    }

    {
        System.out.println("执行 Son object a=" + a);
    }

    public Son() {
        System.out.println("执行 Son construct a=" + a);
        a = 4;
    }
}

@Test
public void testLoad() {

// Father father =new Son();
System.out.println(Son.a);
}

运行结果及报错内容

代码输出2, 说明只执行了父类的静态代码块，子类的静态代码块为啥不执行

Answer 1

静态代码块在类加载的时候只会执行一次~子类继承父类，会先执行父类的代码块。