单例模式

 1 package danlimoshi;
 2 
 3 public class FactoryTest {
 4     public static void main(String[] args) {
 5         Factory factory=Factory.getFactory();
 6         System.out.println("factory  "+factory);
 7         Factory factory2=Factory.getFactory();
 8         factory2.setFactory("张三", 20);
 9         System.out.println("factory2  "+factory2+"factory  "+factory);
10         System.out.println(factory==factory2);
11     }
12 }
13 
14  class Factory {
15     private static Factory factory = new Factory();
16     private static String name="单例模式";
17     private static int age=18;
18     private Factory(){};
19 
20     static Factory getFactory() {
21         return factory;
22     }
23     
24     static void setFactory(String name,int age) {
25         Factory.name=name;
26         Factory.age=age;
27     }
28 
29     @Override
30     public String toString() {
31         return "Factory [name="+name+", age="+age+"]";
32     }
33     
34     
35 }

1 factory  Factory [name=单例模式, age=18]
2 factory2  Factory [name=张三, age=20]factory  Factory [name=张三, age=20]
3 true