20 带参构造方法（this关键字）

Cat.java:

package com.wys.javaoop;

import javax.naming.NamingEnumeration;

/**
 * 宠物猫类
 * @author snape
 */
public class Cat {
    //成员属性：
    String name;    //昵称    默认值为null
    int month;      //年龄    默认值为0
    double weight;  //体重    默认值为0.0
    String species; //品种    默认值为null

    //成员方法：
    public Cat() {
    }

    //带参构造方法
    public Cat(String name, int month, double weight, String species){
        this.name = name;
        this.month = month;
        this.weight = weight;
        this.species = species;
    }

    //跑动方法
    public void run(){
        System.out.println("猫跑动");
    }

    //跑动方法，重载
    public void run(String name){
        System.out.println(name + "跑动");
    }

    //吃东西方法
    public void eat(){
        System.out.println("猫吃东西");
    }

}

CatTest.java:

package com.wys.javaoop;

import com.sun.xml.internal.bind.v2.runtime.reflect.Accessor;

public class CatTest {
    public static void main(String[] args) {
        Cat one = new Cat("mimi", 2, 3000, "英国短毛猫");

        System.out.println("名字：" + one.name);
        System.out.println("年龄：" + one.month);
        System.out.println("体重：" + one.weight);
        System.out.println("品种：" + one.species);
    }
}

结果：