有参方法和包的概念

• 模拟银行账户业务
  创建包bank.com，
  编写Account类，添加带参
  方法实现存款和取款业务，
  存款时帐户初始金额为0元，
  取款时如果余额不足给出提示

 int chushi=0;
    public int yewu(int y,int c)
    {
        if (y==1){
            chushi=chushi+c;
            System.out.println("存款成功");
            System.out.println("当前余额为"+chushi);
        }
         return chushi;
    }
    public int yewu2(int y,int c)
    {
        if (y==2){
            chushi=chushi-c;
           if (chushi<=0){
                System.out.println("余额不足");

            }
            else {
                System.out.println("取款成功");
                System.out.println("当前余额为" + chushi);
            }
        }
        return chushi;
    }
    public int yewu3(int y)
    {
        if (y==0){
            System.out.println("谢谢使用");
        }
        return chushi;
    }

  Account a = new Account();
        Scanner scanner = new Scanner(System.in);
System.out.println("1.存款"+"2.取款"+"0.退出");
       for (int i=0;i >-1;i++) {
           System.out.println("请输入你选择的业务");
           int s = scanner.nextInt();
           if (s == 2) {
               System.out.println("请输入取款金额");
               int q = scanner.nextInt();
               a.yewu2(s, q);
           }
           else if (s==0){
               a.yewu3(s);
               break;
           }

           else {
               System.out.println("请输入存款金额");
               int j = scanner.nextInt();
               a.yewu(s, j);
           }