check.java

Java 入门书的源码

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

// Debugging Exercise 5.8 -- Has Errors

               public class Check {
                 Account account;
                 public Check(Account a){
                     account = a;
                 } 
                 public boolean checkId(String id){
                     String s = account.getId();
                     int length = s.length();
                     boolean result = false;
                     if (s.substring(length-4,length)==id) 
                        result = true;
                     return result;
                 }
                 public static void main (String[] args) {
                     Name name = new Name("Java", 'A', "Student");
                     Address address = 
                                new Address("76 Applet Way","Web City","FL","44444");
                     Person person = new Person("123456789",name,address);
                     Account a = new Savings(1500.00,person,4.0);
                     Check c = new Check(a);
                     System.out.println(c.checkId("6789"));
                 }
             }