/**
 *
 * @author Mutasem
 */
public abstract class Strategy {
    public abstract void execute();
}

/******************************/
public class Strategy1 extends Strategy{

    @Override
    public void execute() {
        System.out.println("Strategy1.execute()");
    }
    
}

/*****************************/
public class Strategy2 extends Strategy{

    @Override
    public void execute() {
        System.out.println("Strategy2.execute()");
    }
    
}

/*************************/
public class Context {
    private Strategy strategy;

    public Context(Strategy strategy) {
        this.strategy = strategy;
    }

    public Strategy getStrategy() {
        return strategy;
    }

    public void setStrategy(Strategy strategy) {
        this.strategy = strategy;
    }
    public void work(){
    strategy.execute();
    }
}