策略模式

策略模式（Strategy Pattern）中，一个类的行为或其算法可以在运行时更改。这种类型的设计模式属于行为型模式。

代码语言：javascript复制

public interface Strategy {
   public int doOperation(int num1, int num2);
}

代码语言：javascript复制

public class OperationAdd implements Strategy{
   @Override
   public int doOperation(int num1, int num2) {
      return num1   num2;
   }
}

代码语言：javascript复制

public class OperationMultiply implements Strategy{
   @Override
   public int doOperation(int num1, int num2) {
      return num1 * num2;
   }
}

代码语言：javascript复制

public class Context {
   private Strategy strategy;
 
   public Context(Strategy strategy){
      this.strategy = strategy;
   }
 
   public int executeStrategy(int num1, int num2){
      return strategy.doOperation(num1, num2);
   }
}

代码语言：javascript复制

public class StrategyPatternDemo {
   public static void main(String[] args) {
      Context context = new Context(new OperationAdd());    
      System.out.println("10   5 = "   context.executeStrategy(10, 5));
 
      context = new Context(new OperationSubtract());      
      System.out.println("10 - 5 = "   context.executeStrategy(10, 5));
 
      context = new Context(new OperationMultiply());    
      System.out.println("10 * 5 = "   context.executeStrategy(10, 5));
   }
}

架构设计

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