Java 类和对象

Posted 2020-07-06 唐枫

编写Java应用程序。首先定义一个描述银行账户的Account类，包括成员变

量“账号”和“存款余额”，成员方法有“存款”、“取款”和“余额查询”。其次，

编写一个主类，在主类中测试Account类的功能。

类：

 

 1     String bankAccountNumber;
 2     String name;
 3     double cunKuanYu_e;
 4 
 5     void cunkuan(double cunkuan) {
 6         cunKuanYu_e = cunKuanYu_e + cunkuan;
 7         System.out.println(name + "你的账号为：" + bankAccountNumber + "的账户中存入" + cunkuan + "元，现有余额" + cunKuanYu_e);
 8     }
 9 
10     void qukuan(double qukuan) {
11         if (cunKuanYu_e >= qukuan) {
12             cunKuanYu_e = cunKuanYu_e - qukuan;
13             System.out.println(name + "你的账号为：" + bankAccountNumber + "的账户中取出" + qukuan + "元，现有余额" + cunKuanYu_e);
14         } else {
15             System.out.println(name + "你的账号为：" + bankAccountNumber + "的账户中余额不足！");
16         }
17     }
18 
19     double getYu_E() {
20         return cunKuanYu_e;
21     }

 

 

 

调用：

 1         Account ren1=new Account();
 2         ren1.bankAccountNumber="622848123456789";
 3         ren1.name="张三";
 4         ren1.cunKuanYu_e=587.54;
 5         
 6     
 7         ren1.qukuan(600.0);
 8         System.out.println(ren1.name+"余额="+ren1.getYu_E());
 9         ren1.cunkuan(1000);
10         
11         Account ren2=new Account();
12         ren2.bankAccountNumber="622848987654321";
13         ren2.name="李四";
14         ren2.cunKuanYu_e=87.54;
15         
16         
17         double ren1ye=ren1.getYu_E();
18         System.out.println(ren1.name+"的账户余额："+ren1ye);
19         double ren2ye=ren2.getYu_E();
20         System.out.println(ren2.name+"的账户余额："+ren2ye);

 

 

结果: