要求如下：自定义一个银行账户类，包括属性（用户名，账号，余额）以及方法（存钱、取钱、加利息、查询余额）。遵从封装原则。 创建两个用户对象，
模拟两个用户的各3次交易，例如：取钱，存钱，查询余额。
创建账户所需的信息由键盘输入；存钱、取钱的数额由随机数模拟，随机数上限为10，000。每次账户交易在屏幕打印交易后的账户信息
public class Transactions
{
public static class Bankaccount {
private final double RATE=0.05;
private String name;
private int accountnumber;
private double balance;
public Bankaccount(String username,int accountnumber,double balance)
{
name=username;
this.accountnumber=accountnumber;
this.balance=balance;
}
/////////////////////////////////
//查询余额
public double getbalance() {
return balance;
}
//存钱
public double deposit(double amount)
{
balance+=amount;
return balance;
}
//取钱
public double withdraw(double amount) {
balance-=amount;
return balance;
}
//利息
public double addinterest() {
balance*=1+RATE;
return balance;
}
public String toString(){
NumberFormat fmt=NumberFormat.getCurrencyInstance();
return accountnumber+"\t"+name+"\t"+fmt.format(balance);
}
}
public static void main(String[] args)
{
Random g=new Random();
Bankaccount user1=new Bankaccount("xiaoming",001,20);
Bankaccount user2=new Bankaccount("xiaohua",002,50);
user1.deposit(g.nextDouble()*10000+1);
System.out.println(user1);
user1.withdraw(g.nextDouble()*10000+1);
System.out.println(user1);
user1.getbalance();
System.out.println(user1);
user2.deposit(g.nextDouble()*10000+1);
System.out.println(user2);
user2.withdraw(g.nextDouble()*10000+1);
System.out.println(user2);
user2.getbalance();
System.out.println(user2);
}
//
}
static class Bankaccount
这里不应该用静态类
并且Bankaccount 应该独立，而不是放在 Transactions里。因为调用者和被调用者毫无关系。