练习练习

import java.util.Scanner;//包含包public class ex1
{public static void main(String args[])//程序入口{Phone phone = new Phone();//建一个手机phone.logo = "SONY";//弄上个牌子phone.battery.power = 100;//给电池弄上100电Scanner reader = new Scanner(System.in);//为输入XXX做准备int command = 0;//为选择用boolean sign = true;//循环标志System.out.printf("输入1听音乐\n输入2充电\n输入3显示电量\n");while(sign){command = reader.nextInt();//输入...switch (command){case 1:System.out.println("听音乐");phone.music();//播放音乐phone.showpower();//显示电量break;case 2:System.out.println("充电");phone.showpower();phone.inpower();//充电break;case 3:System.out.println("显示电量");phone.showpower();break;case 4:sign = false;//结束循环，结束程序。break;default://缺省break;}}}
}
class Phone//电话类
{String logo;//牌子Battery battery = new Battery();//给电话加上电池Music music = new Music();//电话的音乐void music(){if(music.have())//没有音乐是不能播放音乐的{if(battery.outpower())//播放音乐就会使用电池System.out.println("music......" + music.song);elseSystem.out.println("battery low");}elseSystem.out.println("song null");}void inpower()//电池充电{if(battery.inpower())System.out.println("电量已充满");elseshowpower();}void showpower()//显示电量{System.out.println("当前电量" + battery.power);}
}class Battery//电池类
{String logo;short power;boolean inpower()//充电{power += 10;if(power >= 100){power = 100;return  true;}else{return  false;}}boolean outpower()//使用电量{if(power >= 10){power -= 10;return true;}else{power = 0;return false;}}}class Music
{String song = "song1";void list()//音乐清单，【没空去实现选择了】{System.out.println("song1");System.out.println("song2");System.out.println("song3");System.out.println("song4");}boolean have()//是否有音乐{if(song == "null")return false;elsereturn true;}boolean down(short num)//下载音乐{switch (num){case 1:song = "song1";break;case 2:song = "song2";break;case 3:song = "song3";break;case 4:song = "song4";break;default:return false;}return true;}
}