策略模式

package 策略模式;

public interface IStrategy {
     
	public void operate();

}
//**************************************************************************
package 策略模式;

public class BackDoor implements IStrategy {

	public void operate() {
		
		System.out.println("找乔国老帮忙，让吴国老给孙权施加压力···");

	}

}

//**************************************************************************

package 策略模式;

public class GivenGreenLight implements IStrategy {

	public void operate() {
      System.out.println("求吴国老给开灯，放行····");
	}

}

//**************************************************************************

package 策略模式;

public class BlockEnemy implements IStrategy {

	public void operate() {

		System.out.println("孙夫人断后，挡住追兵···");

	}

}
//**************************************************************************

package 策略模式;

public class Context {
	
     private IStrategy strategy;
     
     public Context(IStrategy strategy){
    	  this.strategy = strategy;
     }
     
     public void operate(){
    	 this.strategy.operate();
     }
     
}
//**************************************************************************

package 策略模式;

public class ZhaoYun {
	
	public static void main(String args[]){
		
		Context context;
		System.out.println("刚刚到吴国的时候，折开第一个···");
		context = new Context(new BackDoor());
		context.operate();
		
		System.out.println("刘备乐不思蜀，于是折开第二个···");
		context = new Context(new GivenGreenLight());
		context.operate();
		
		System.out.println("孙权的小兵追了，于是折开第三个···");
		context = new Context(new BlockEnemy());
		context.operate();
		
		
	}
	
	
}
//**************************************************************************