05 - 策略模式

1 package com.dp.strategypattern;
2 
3 public interface IStrategy {
4     public void doSomething();
5 }

1 package com.dp.strategypattern;
2 
3 public class Strategy1 implements IStrategy {
4     @Override
5     public void doSomething() {
6         System.out.println("具体策略------》 1");
7     }
8 }

1 package com.dp.strategypattern;
2 
3 public class Strategy2 implements IStrategy {
4     @Override
5     public void doSomething() {
6         System.out.println("具体策略------》 2");
7     }
8 }

 1 package com.dp.strategypattern;
 2 
 3 public class Context {
 4     private IStrategy strategy;
 5     
 6     public Context(IStrategy strategy){
 7         this.strategy = strategy;
 8     }
 9     
10     public void execute(){
11         strategy.doSomething();
12     }
13 }

 1 package com.dp.strategypattern;
 2 
 3 public class StrategyTest {
 4     
 5     public static void main(String[] args){
 6         Context context;
 7         System.out.println("execute Strategy 1");
 8         context = new Context(new Strategy1());
 9         context.execute();
10         
11         System.out.println("execute Strategy 2");
12         context = new Context(new Strategy2());
13         context.execute();
14     }
15 }