p65 创建对象内存分析

p65

创建对象内存分析

Pet类

package com.oop.Demo03;

public class Pet {
    public String name;
    public int age;

    //默认有无参构造
    public void shout(){
        System.out.println("叫了一声");
    }
}

package com.oop.Demo02;

import com.oop.Demo03.Pet;

//一个项目应该只存在一个main方法
public class Application {
    public static void main(String[] args) {

        Pet dog = new Pet();
        dog.name = "旺财";
        dog.age = 3;
        dog.shout();

        System.out.println(dog.name);
        System.out.println(dog.age);

        Pet cat = new Pet();
    }
}