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    1. package com.atguigu.exercise2;
    2. public class Account {
    4.     //属性
    5.     private int id;
    6.     private String pwd = "000000";//密码
    7.     private double balance;//余额
    9.     private static double interestRate;//利率
    10.     private static double minMoney = 1.0;//最小余额
    11.     private static int init = 1001;//用于自动生成id使用的
    14.     //构造器
    15.     public Account(){
    16.   id = init++;
    18.     }
    19.     public Account(String pwd,double balance){
    20.   id = init++;
    21.   this.pwd = pwd;
    22.   this.balance = balance;
    23.     }
    26.     //方法
    27.     public String getPwd() {
    28.   return pwd;
    29.     }
    30.     public void setPwd(String pwd) {
    31.   this.pwd = pwd;
    32.     }
    33.     public static double getInterestRate() {
    34.   return interestRate;
    35.     }
    36.     public static void setInterestRate(double interestRate) {
    37.   Account.interestRate = interestRate;
    38.     }
    39.     public static double getMinMoney() {
    40.   return minMoney;
    41.     }
    42.     public static void setMinMoney(double minMoney) {
    43.   Account.minMoney = minMoney;
    44.     }
    45.     public int getId() {
    46.   return id;
    47.     }
    48.     public double getBalance() {
    49.   return balance;
    50.     }
    51.     @Override
    52.     public String toString() {
    53.   return "Account [id=" + id + ", pwd=" + pwd + ", balance=" + balance + "]";
    54.     }
    55. }
    1. package com.atguigu.exercise2;
    2. public class AccountTest {
    3.     public static void main(String[] args) {
    5.   Account acct1 = new Account();
    6.   Account acct2 = new Account("qwerty",2000);
    8.   System.out.println(acct1);
    9.   System.out.println(acct2);
    10.     }
    11. }