Question

我有两个java文件。主要活动包含以下内容：

    String randomEvent;

    public void randomTrigger(){

        int min = 1;
        int max = 100;

        Random randomTrigger = new Random();
        int randomNumber = randomTrigger.nextInt(max - min) + min;

        RandomEvent obj = new RandomEvent();

        if (randomNumber == 7) {

            // What do I put here to call the method randomEvent(); in RandomEvent.java ?

        }


    }

    saveSettings();{
        SharedPreferences settings = getSharedPreferences("com.******.******", MODE_PRIVATE);
        settings.edit().putString("randomEvent", randomEvent).commit();
    }

第二个名为“RandomEvent.java的活动是MainActivity的子类：

package com.******.******;

import android.content.SharedPreferences;

public class RandomEvent extends MainActivity {

    public void randomEvent() {

        MainActivity obj = new MainActivity();
        obj.randomEvent = "You've received a pay raise!";

        payRate = payRate * 1.1f;

        saveSettings();

    }
}

我的问题是，如何正确执行randomEvent（）;位于超类MainActivity中的RandomEvent.java类文件中的方法？

Answer 1

通过这样做可以实现： -

public class MainActivity{
 public void randomEvent() {}  

}

public class RandomEvent extends MainActivity{
 @Override
 public void randomEvent() {
    //You stuff
 }   
}

在此方法中，您可以从MainActivity中调用 randomEvent 。但最好这样做： -

public interface Events{
  public void randomEvent();
}

public abstract class MainActivity implements Events{

}

public class RandomEvent extends MainActivity{
  @Override
 public void randomEvent() {
    //You stuff
 } 
}

最好是以这种方式保持代码清洁，或者你可以做的其他事情是： -

public interface Events{
  public void randomEvent();
}
public class MainActivity{
      public Events getEvents(){
        return null;
      }

      public void randomTrigger(){

            Events events = getEvents();
            if(null != events){
               events.randomEvent();
            }
        }


    }
    }

public class RandomEvent extends MainActivity implements Events{
  @Override
 public void randomEvent() {
    //You stuff
 }
 @Override
 public Events getEvents(){
    return this;
  } 
}

最好的是最后一个。

如何在超类中运行子类中的方法？

1 个答案: