策略模式

IStrategy.java

public interface IStrategy {

	public void operate();
	
}

BackDoor.java

/**
 * 乔国老开后门
 */
public class BackDoor implements IStrategy {

	@Override
	public void operate() {
		System.out.println("找乔国老帮忙，让吴国太给孙权施加压力");
	}

}

GivenGreenLight.java

/**
 * 吴国太开绿灯
 */
public class GivenGreenLight implements IStrategy {

	@Override
	public void operate() {
		System.out.println("求吴国太开绿灯，放行！");
	}

}