类加载顺序

class A{
    public int i = m1();
    public static int j = m2();
    public int k = 0;

    public A() {
        System.out.println(1);
    }

    public int m1(){
        System.out.println(2);
        return 2;
    }

    public static int m2(){
        System.out.println(3);
        return 3;
    }
}

　　

class B extends A{

    public int m = m3();
    public static int n = m4();
    public int t = 0;

    public B(){
        System.out.println(4);
    }

    public int m3(){
        System.out.println(5);
        return 5;
    }

    public static int m4(){
        System.out.println(6);
        return 6;
    }

    /**
     * 加载顺序:
     *     父类静态（不包括静态方法）--> 子类静态(不包括静态方法) --> sout(7) -->
     *     父类非静态变量 --> 父类构造器 --> 子类变量 --> 子类构造器
     *
     *
     */
    public static void main(String[] args) {
        System.out.println(7);
        A a = new B();
    }
}

执行结果：

3
6
7
2
1
5
4