【Java 基础实例—Bank 项目1】

(上图Wie任务要求的UML结构)

Account.java 文件:

 package Banking_1;

 public class Account {
     private double balance;//余额  ,uml前该变量是 '-'
     public Account(double init_balance){
         balance=init_balance;
     }
     public double getBalance() {
         return balance;
     }
     //存钱
     public void deposit(double amt){
         this.balance+=amt;
     }
     //取钱
     public void withdraw(double amt){
         this.balance-=amt;
     }

 }

再写一个测试类:

TestBanking.java的文件:

 package Banking_1;
 /*
  * This class creates the program to test the banking classes.
  * It creates a new Bank, sets the Customer (with an initial balance),
  * and performs a series of transactions with the Account object.
  */

 public class TestBanking {

     public static void main(String[] args) {

         // Create an account that can has a 500.00 balance.
         System.out.println("Creating an account with a 500.00 balance.");
         Account  account=new Account(500.00);
         //code
         System.out.println("Withdraw 150.00");
         account.withdraw(150);

         System.out.println("Deposit 22.50");
         account.deposit(22.5);
         //code
         System.out.println("Withdraw 47.62");
         account.withdraw(47.62);
         //code
         // Print out the final account balance
         System.out.println("The account has a balance of " + account.getBalance());
     }
 }

运行结果: