Strategy Pattern（策略模式）

package strategy; interface Strategy{int execute(int a,int b);} class StrategyAdd implements Strategy{public int execute(int a, int b) {return a+b;} } class StrategyMinus implements Strategy{public int execute(int a, int b) {return a-b;} } class StrategyMultiply implements Strategy{public int execute(int a, int b) {return a*b;} } class Context{ private Strategy strategy; public Context(Strategy s){ this.strategy=s; } public int execute(int a,int b){ return this.strategy.execute(a, b); } } //参考：http://en.wikipedia.org/wiki/Strategy_patternpublic class StrategyApp {/** * @param args */public static void main(String[] args) {System.out.println((new Context(new StrategyAdd())).execute(1, 2));System.out.println((new Context(new StrategyMinus())).execute(1, 2));System.out.println((new Context(new StrategyMultiply())).execute(1, 2));}} 

 

 

参考：http://en.wikipedia.org/wiki/Strategy_pattern