Java超详细教你写一个银行存款系统案例

public class BankAccount {
    private String number;
    private double leftMoney;

    public BankAccount() {
    }

    public BankAccount(String number, double leftMoney) {
        this.number = number;
        this.leftMoney = leftMoney;
    }
    //获取余额
    public double getLeftMoney() {
        return leftMoney;
    }

    //存款
    public void saveMoney(double money){
        leftMoney+=money;
    }

    //取款
    public void getMoney(double money){
        leftMoney-=money;
    }
}

public class Test {
    public static void main(String[] args) {
        BankAccount ABC=new BankAccount("123456",500);
        ABC.saveMoney(1000);
        System.out.println("存款1000后，余额是："+ABC.getLeftMoney());
        ABC.getMoney(500);
        System.out.println("取款500后，余额是："+ABC.getLeftMoney());
    }
}