static应用举例

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 1 package com.fu.statictest;
 2 
 3 /**
 4  * static应用举例：
 5  * 编写一个类实现银行账户的概念，包含的属性有 “账号”、“密码”、“存款余额”、“利率”、“最小余额”，
 6  * 定义封装这些属性的方法，账户自动生成。
 7  * 编写主类，使用银行账户类，输入，输出3个储蓄的上述信息。
 8  * 考虑：哪些属性可以设计为static属性
 9  *
10  *
11  *
12  */
13 public class Account {
14     private int id;
15     private String password = "000000";
16     private double balance = 0.0;
17     private static double interestRate;
18     private static double minBalance = 1.0;
19     private static int init = 1001;//用于自动生成账户使用的
20 
21     public Account(){
22         id = init++;
23     }
24 
25     public Account(String password, double balance) {
26         this();
27         this.password = password;
28         this.balance = balance;
29     }
30 
31     public int getId(){
32         return id;
33     }
34 
35     public String getPassword() {
36         return password;
37     }
38 
39     public void setPassword(String password) {
40         this.password = password;
41     }
42 
43     public double getBalance() {
44         return balance;
45     }
46 
47     public static double getInterestRate() {
48         return interestRate;
49     }
50 
51     public static void setInterestRate(double interestRate) {
52         Account.interestRate = interestRate;
53     }
54 
55     public static double getMinBalance() {
56         return minBalance;
57     }
58 
59     public static void setMinBalance(double minBalance) {
60         Account.minBalance = minBalance;
61     }
62 
63     @Override
64     public String toString() {
65         return "Account{" +
66                 "id=" + id +
67                 ", password='" + password + '\'' +
68                 ", balance=" + balance +
69                 '}';
70     }
71 }

package com.fu.statictest;

public class AccountTest {
    public static void main(String[] args) {
        Account acct1 = new Account("666666",20);
        Account acct2 = new Account("123456",40);
        Account acct3 = new Account("987654",100);
        Account.setInterestRate(0.02);
        System.out.println("账户："+ acct1.getId() +" 密码："+ acct1.getPassword()+ " 余额："+ acct1.getBalance());
        System.out.println(acct1);
        System.out.println(acct2);
        System.out.println(acct3);
        System.out.println("利率："+Account.getInterestRate());
        System.out.println("最小余额："+Account.getMinBalance());


    }
}

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