设计模式（一）

 1 package com.frank.bank;
 2 
 3 public class Bank {
 4   private static Bank bank = null;
 5   private Bank(){
 6   }
 7   public static Bank getBank(){
 8     if(bank == null){
 9       sp = new Bank();
10     }
11     return bank;
12   }
13 }

 1 package com.frank.bank.test;
 2 
 3 public class Test {
 4 
 5   /**
 6    * @param fank
 7    */
 8       public static void main(String[] args) {
 9           Bank bank1 = Bank.getBank();
10           Bank bank2 = Bank.getBank();
11           System.out.println(bank1);
12           System.out.println(bank2);
13           if(bank1 == bank2){
14                 System.out.println("the same Object");
15             }
16       }
17 }