面向对象

创建对象内存分析

package com.oop.demo03;

public class Application {
    public static void main(String[] args) {

        Pet dog = new Pet();
        dog.name = "wawa";
        dog.age = 3;
        dog.shout();//叫了一声
        System.out.println(dog.name);//wawa
        System.out.println(dog.age);//3

    }
}

package com.oop.demo03;

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

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

}