Question

我是客观编程的新手，我需要使用其他类的方法。我有方法decreaseTemperature（int alpha）;在java类中名为Reactor（它只是一个简单的命令alpha - = 1）它应该每fps降低1的温度....

Reactor reactor = new Reactor（）; - 我不能用这个

public class Cooler extends AbstractActor{

private final Animation fanAnimation;

public Cooler(Reactor reactor){            //this must be like that
    fanAnimation = new Animation("resources/images/fan.png", 32, 32, 200);
    setAnimation(fanAnimation);
    fanAnimation.setPingPong(true);
}

@Override
public void act(){
    reactor.decreaseTemperature(1);         //Here is a problem (this does not work) 
}
}

Answer 1

您的act()方法无法访问reactor实例变量。如果需要将其传递给Cooler构造函数，则需要保存它以便类中的其他方法可以访问它。试试这个：

private final Animation fanAnimation;
private Reactor reactor;

public Cooler(Reactor reactor){            //this must be like that
    this.reactor = reactor;  // save the passed in parameter
    fanAnimation = new Animation("resources/images/fan.png", 32, 32, 200);
    setAnimation(fanAnimation);
    fanAnimation.setPingPong(true);
}

@Override
public void act(){
    reactor.decreaseTemperature(1);  // this now refers to the private Reactor instance variable
}

目标java使用另一个类的方法

1 个答案: