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  • 享元模式

    享元模式是对象的结构模式。享元模式以共享的方式高效地支持大量的细粒度对象。

     1 import java.util.HashMap;
     2 import java.util.Map;
     3 
     4 //抽象享元接口
     5 interface Flyweight{
     6     //state参数为外蕴状态
     7     public void method(String state);
     8 }
     9 
    10 //具体享元类
    11 class ConcreteFlyweight implements Flyweight{
    12 
    13     private String inState;
    14     
    15     //内蕴状态作为参数传入
    16     public ConcreteFlyweight(String inState){
    17         this.inState = inState;
    18     }
    19     
    20     @Override
    21     public void method(String state) {
    22         System.out.println("外蕴状态" + state);
    23         System.out.println("内蕴状态" + inState);
    24     }
    25     
    26 }
    27 
    28 //享元工厂类
    29 class FlyweightFactory{
    30     
    31     private Map<String, Flyweight> flies = new HashMap<String, Flyweight>();
    32     
    33     public Flyweight factory(String inState){
    34         //从缓存中查询有没有指定的变量
    35         Flyweight fly = flies.get(inState);
    36         if(null == fly){
    37             fly = new ConcreteFlyweight(inState);
    38             flies.put(inState, fly);
    39         }
    40         return fly;
    41     }
    42 }
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  • 原文地址:https://www.cnblogs.com/gsbm/p/4804151.html
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