bankaccount.java

来自「Java 入门书的源码」· Java 代码 · 共 60 行

//Copyright (c) 1998, Arthur Gittleman
//This example is provided WITHOUT ANY WARRANTY either expressed or implied.

         /* Revision of Example 3.11
          * Adds setBalance method
          */

      import iopack.Io;
      public class BankAccount {

           private double balance;                                                                 

           public BankAccount()   {                                                                    
                balance = 0;
           }

           public BankAccount(double initialAmount) {
                balance = initialAmount;
           }

           public void deposit(double amount) {                                             
                balance += amount;
           }

           public void withdraw(double amount) {
                if (balance >= amount)
                     balance -= amount;
                else
                     System.out.println("Insufficient funds");
           } 

           public double getBalance() {                                                         
                 return balance;
           }
         
           public void setBalance(double amount) {
                 balance = amount;
           }    

           public static void main (String [ ] args) {                                         
              BankAccount myAccount = new BankAccount(25.00);              
              System.out.print("My balance = ");
              Io.println$(myAccount.getBalance());
              myAccount.deposit(700.00);                                                          
              System.out.print("My balance = ");
              Io.println$(myAccount.getBalance());
              myAccount.withdraw(300.00);
              System.out.print("My balance = ");
              Io.println$(myAccount.getBalance());
              myAccount.withdraw(450.00);
              System.out.print("My balance = ");
              Io.println$(myAccount.getBalance());
              BankAccount  yourAccount = new BankAccount();                                            
              yourAccount.deposit(1234.56);                                                   
              System.out.print("Your balance = ");
              Io.print$(yourAccount.getBalance());
              Io.readString("Press any key to exit");   // Added for IDE use 
          }
       }