Question

java定义一个类实现银行帐户的概念

问题具体如下图

Answer 1

public class BankAccount {

String account ;
int account_num;

//构造函数
public BankAccount(String account,int account_num){
this.account=account;
this.account_num=account_num;
}
//存钱
public String addNum(int num){
account_num= account_num+num;
return "存钱成功";
}

//取钱
public String getNum(int num){
String result;
if(account_num>num){
account_num =account_num-num;
result="取钱成功";
}else{
result="账户余额不足，还剩"+account_num;
}
return result;
}

//显示余额
public String displayNum(){
return "账户余额："+account_num;
}

//显示账号
public String displayAccount(){
return "账户："+account;
}

public static void main(String[] args){
BankAccount lucy = new BankAccount("lucy",100);
BankAccount jack = new BankAccount("jack",50);
//显示他们各自的余额
System.out.println("===显示他们各自的余额===");
System.out.println("lucy:"+lucy.displayNum());
System.out.println("jack:"+jack.displayNum());
//存钱取钱
System.out.println("===存钱取钱===");
System.out.println("lucy取50:"+lucy.getNum(50));
System.out.println("jack存200:"+jack.addNum(200));
//显示账户 显示余额
System.out.println("===存钱取钱===");
System.out.println(lucy.displayAccount()+""+lucy.displayNum());
System.out.println(jack.displayAccount()+""+jack.displayNum());

}

}

运行结果：
===显示他们各自的余额===
lucy:账户余额：100
jack:账户余额：50
===存钱取钱===
lucy取50:取钱成功
jack存200:存钱成功
===存钱取钱===
账户：lucy账户余额：50
账户：jack账户余额：250

追问

额 你这个是百度的吧 。。。。

Answer 2

public class BankAccount {

String account ;
int account_num;

//构造函数
public BankAccount(String account,int account_num){
this.account=account;
this.account_num=account_num;
}
//存钱
public String addNum(int num){
account_num= account_num+num;
return "存钱成功";
}

//取钱
public String getNum(int num){
String result;
if(account_num>num){
account_num =account_num-num;
result="取钱成功";
}else{
result="账户余额不足，还剩"+account_num;
}
return result;
}

//显示余额
public String displayNum(){
return "账户余额："+account_num;
}

//显示账号
public String displayAccount(){
return "账户："+account;
}

public static void main(String[] args){
BankAccount lucy = new BankAccount("lucy",100);
BankAccount jack = new BankAccount("jack",50);
//显示他们各自的余额
System.out.println("===显示他们各自的余额===");
System.out.println("lucy:"+lucy.displayNum());
System.out.println("jack:"+jack.displayNum());
//存钱取钱
System.out.println("===存钱取钱===");
System.out.println("lucy取50:"+lucy.getNum(50));
System.out.println("jack存200:"+jack.addNum(200));
//显示账户 显示余额
System.out.println("===存钱取钱===");
System.out.println(lucy.displayAccount()+""+lucy.displayNum());
System.out.println(jack.displayAccount()+""+jack.displayNum());

}

}

运行结果：
===显示他们各自的余额===
lucy:账户余额：100
jack:账户余额：50
===存钱取钱===
lucy取50:取钱成功
jack存200:存钱成功
===存钱取钱===
账户：lucy账户余额：50
账户：jack账户余额：250