wallet.java

一个JAVA小程序实例——电子钱包

import java.io.*;

public class Wallet

{

        private int money; 

      public void Wallet() 

        {

           money = 0;

        }

       // 往钱包中存钱

        public void saveMoney(int inputMoney) 

        {           money = money + inputMoney;

        }

       //从钱包中取钱

        public void loadMoney(int inputMoney)

        {

           money = money - inputMoney;

        }

       //检查钱包中资金余额，并打印

        public void checkAvailable()

        {

           System.out.println("余额为"+money);

        }

        public static void main(String[] args) throws IOException

        {

           Wallet wt = new Wallet();
           Boolean b;
          do{
           
           System.out.println("存钱按1，取钱按2,查询余额请按3");

        BufferedReader reader1 = new BufferedReader(new InputStreamReader(System.in)); 

           String s=reader1.readLine();

          Integer in=new Integer(s);

                           switch(in)

                   {   
      
                    case 1:        { System.out.println("你要存入多少钱？");

                    BufferedReader reader2 = new BufferedReader(new InputStreamReader(System.in)); 

                    String s1=reader2.readLine();

                    Integer in1=new Integer(s1);

                    wt.saveMoney(in1);}    break;

                    case 2: {      System.out.println("你要取出多少钱？");


                    BufferedReader reader3 = new BufferedReader(new InputStreamReader(System.in)); 
                         String s1=reader3.readLine();

                      Integer in2=new Integer(s1);

                    wt.loadMoney(in2);}    break;
                     case 3:wt.checkAvailable();
                   
                    }
              System.out.println("如果要继续请按“E”键,退出直接ENTER");
                         BufferedReader r3=new BufferedReader(new InputStreamReader(System.in));
                         String s3=r3.readLine(); 
                          b=(s3.equals("e"));      
            }while(b);

        }

}