[网络协议]JAVA构造方法，例：Person类

public class TestConstructor {
    public static void main(String[] args) {
        //每次new对象时，都会自动触发对应类的构造方法
        //每一个类都会默认存在一个无参的构造方法
        Person p = new Person();
        System.out.println(p.getAddress());
        System.out.println(p.getAge());
        System.out.println(p.getName());
        //在每次创建对象时，都会执行构造方法
        //构造方法的作用：用来创建对象
        Person p2 = new Person("张三",18,"白宫");
        System.out.println(p2.getAddress());
        System.out.println(p2.getAge());
        System.out.println(p2.getName());
    }
}

//创建Person类。，用来描述任这一类事物
class Person{
    private String name;
    private int age;
    private String address;

    //构造方法--有参
    public Person(String name, int age, String address) {
        this.name = name;
        this.age = age;
        this.address = address;
    }

    //构造方法--无参
    public Person() {
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public String getAddress() {
        return address;
    }

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

    public void eat(){
        System.out.println("干饭不积极，脑子有问题");
    }

}