java 类和对象的小练习，银行存取钱数。

public class Account 
{
    String zhanghu;
    double cunkuanyue;
    //先初始化
    Account(String zhanghu,double cunkuanyue)
    {
        this.zhanghu=zhanghu;
        this.cunkuanyue=cunkuanyue;
    }
    //存款
    double cunkuan(double qianshu)
    {
        if(qianshu<0)
        {
            System.out.println("钱数错误");
            
        }
        else
        {
        
        System.out.println("您存了"+qianshu);
        this.cunkuanyue+=qianshu;
        
        }
        return this.cunkuanyue;
    }
    
    /*
    void cunkuan(double qianshu)
    {
        //验证
        if(qianshu<0)
        {
            System.out.println("钱数错误");
            return;
        }
        System.out.println("我存了"+qianshu);
        this.cunkuanyue+=qianshu;
    }
    
    */
    
    
    //取款
    
    void qukuan(double qianshu)
    {
        if(qianshu>this.cunkuanyue)
        {
            System.out.println("余额不足");
            return;
        }
        System.out.println("我取了"+qianshu);
        this.cunkuanyue-=qianshu;
    }
    
    
    
    
    //查询余额
    double getyue()
    {
        return this.cunkuanyue;
    }
    

    
    public static void main(String[] args)
    { 
        Account a=new Account("123456",1000);
        a.cunkuan(100);
        System.out.println("查询余额="+a.getyue());
        a.qukuan(200);
        System.out.println("查询余额= "+a.getyue());

    }

}