行为型模式-策略模式

　　行为型模式又可以分成以下四类：第一类：通过父类与子类的关系进行实现。第二类：两个类之间。第三类：类的状态。第四类：通过中间类

　　策略模式属于第一类，父类与子类的关系

　　即处理一个问题可以采取的不同算法，同时对算法进行封装

　　以计算为例

package behavior.pattern.extend.strategy; public interface ICaculator { public int caculate(String exp); } package behavior.pattern.extend.strategy; public abstract class AbstractCalculator { public int[] split(String exp,String opt){ String array[] = exp.split(opt); int arrayInt[] = new int[2]; arrayInt[0] = Integer.parseInt(array[0]); arrayInt[1] = Integer.parseInt(array[1]); return arrayInt; } } package behavior.pattern.extend.strategy; public class Plus extends AbstractCalculator implements ICaculator { @Override public int caculate(String exp) { int arrayInt[] = split(exp,"\\+"); return arrayInt[0]+arrayInt[1]; } } package behavior.pattern.extend.strategy; public class Minus extends AbstractCalculator implements ICaculator { @Override public int caculate(String exp) { int arrayInt[] = split(exp,"\\-"); return arrayInt[0]-arrayInt[1]; } } package behavior.pattern.extend.strategy; public class Multiply extends AbstractCalculator implements ICaculator{ @Override public int caculate(String exp) { int arrayInt[] = split(exp,"\\*"); return arrayInt[0]*arrayInt[1]; } } package behavior.pattern.extend.strategy; public class CaculateStrategy{ private ICaculator caculator; public CaculateStrategy(ICaculator caculator) { super(); this.caculator = caculator; } public void setCaculator(ICaculator caculator) { this.caculator = caculator; } public int caculate(String exp) { return caculator.caculate(exp); } }

　　测试代码

package behavior.pattern.extend.strategy; public class Client { public static void main(String[] args) { CaculateStrategy caculateStrategy = new CaculateStrategy(new Plus()); int plus = caculateStrategy.caculate("1+2"); System.out.println(plus); caculateStrategy.setCaculator(new Multiply()); int multiply = caculateStrategy.caculate("5*6"); System.out.println(multiply); caculateStrategy.setCaculator(new Minus()); int minus = caculateStrategy.caculate("10-3"); System.out.println(minus); } }

　　运行结果

转载于:https://www.cnblogs.com/liunianfeiyu/p/10122058.html