Java类加载顺序解析-优快云博客

本文链接：https://blog.youkuaiyun.com/weixin_43937112/article/details/105008784

package com.jnhm.test.instantiationOrder;

/**
 * @Description: 测试类实化顺序
 * @Author: XiaoTaoTaoT
 * @Date: 2020/3/21 13:26
 **/
public class TestInstantiationOrderFather {
    public static String str = sayStr("父类静态变量执行");
    public String str2 = sayStr("父类成员变量执行");

    static {
        System.out.println("父类静态代码块执行");
    }

    {
        System.out.println("父类非静态代码块执行");
    }

    public TestInstantiationOrderFather() {
        System.out.println("父类构造方法执行");
    }

    public static String sayStr(String str) {
        System.out.println(str);
        return str;
    }

    public String method() {
        return "父类成员函数";
    }

}

package com.jnhm.test.instantiationOrder;

public class TestInstantiationOrderChild extends TestInstantiationOrderFather {
    public static String str = sayStr("子类静态变量执行");
    public String str2 = sayStr("子类成员变量执行");

    static {
        System.out.println("子类静态代码块执行");
    }

    {
        System.out.println("子类非静态代码块执行");
    }

    public TestInstantiationOrderChild() {// 构造函数无返回值，在实例化对象的时候魏队形赋值
        System.out.println("子类构造方法执行");
        this.str2 = "hello";
    }

    public static String sayStr(String str) {
        System.out.println(str);
        return str;
    }

    public String method() {
        return "调用子类成员方法";
    }

    public static void main(String args[]) {
        new TestInstantiationOrderChild();
    }
}