java 继承关系中 对象信息的存储

package test;

import com.alibaba.fastjson.JSON;


public class Test4 {
	public static void main(String[] args) {
		Child child = new Child("Chi","10");
		Pe pe = child;
		Object object = pe;
		System.out.println(JSON.toJSONString(child));
		System.out.println(JSON.toJSONString(pe));
		System.out.println(JSON.toJSONString(object));
        //控制台结果:
        //{"address":"address","age":"10","name":"Chi"}
        //{"address":"address","age":"10","name":"Chi"}
        //{"address":"address","age":"10","name":"Chi"}
	}
}
class Pe{
	private String Name= "P";
	private String address = "address";
	
	public String getAddress() {
		return address;
	}

	public void setAddress(String address) {
		this.address = address;
	}

	public String getName() {
		return Name;
	}

	public void setName(String name) {
		Name = name;
	}
	
	public Pe() {
		super();
	}

	public Pe(String name) {
		super();
		Name = name;
	}
	
}
class Child extends Pe{
	private String age;
	private String name;

	public Child() {
		super();
	}

	public Child(String name,String age) {
		super("P");
		this.name = name;
		this.age = age;
	}
	public String getAge() {
		return age;
	}
	
	public void setAge(String age) {
		this.age = age;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	
}

首先:父类 Pe类中包含私有字段两个:name,address; 子类Child类中包含私有字段两个:name,age;

创建子类对象;jvm 初始化对象(父类,子类);

现在的子类对象引用指向的内存中包含了哪些信息呢?

包含父类两个属性,和子类两个属性;

当子类属性与父类属性相同时,会覆盖父类属性(不可见),当子类属性没有,父类属性存在时,显示的是父类属性.