随堂笔记
/**
@author yuhuicun
@date 2021/4/20 14:48
*/
public class Phone {
public double width;
public double height;
public int weiht;
public String color;
/*
构造方法 1. 一定没有返回值 2. 方法名字必须和类名完全一致
*/
// 无参构造方法，不管写不写，系统都会生成
public Phone(){
System.out.println("被调用，有一个对象产生");
}
public Phone(double kuandu , double gaodu , int zhongliang , String yanse){
width = kuandu;
height = gaodu ;
weiht = zhongliang;
color = yanse;
}
public Phone (double kuandu , double gao , int zhongliang){
width = kuandu;
height = gao;
weiht = zhongliang;
}
public Phone(int kuandu , int gao , int zhongliang){
width = kuandu ;
height = gao ;
weiht = zhongliang ;
}
public void startUp(){
System.out.println("正在开机");
}
public void suopin(){
System.out.println("手机即将锁屏");
}
//方法的反复
public String toString(){
return"{"+ this.weiht+""+this.height+""+this.weiht+""+this.color;
}
