How do I pass a reference to the outer class to a method in an inner class? ( Or how do I pass "this" to an inner class? )

Question

I have a class as follows:

private class LanePair {

 public int cameraNumber;

 public Nest nest1, nest2;
 public LanePairStatus status = LanePairStatus.TIMER_OFF;
 Timer timer = new Timer();

 public LanePair(int cameraNunber, Nest nest1, Nest nest2) {
  this.cameraNumber = cameraNumber;
  this.nest1 = nest1;
  this.nest2 = nest2;
 }

 public void startTimer() {
  status = LanePairStatus.TIMER_ON;
  timer.schedule(new TimerTask() {
   public void run() {
    DoAskForLaneClear(/*I want to pass this class (LanePair) here*/);
   }
  }, 6000 ); // 6 seconds
 }

 public void stopTimer() {
  timer.cancel();
 }

}

The thing is, I can't figure out how to do it. Any suggestions?

Related:

• How do you get a reference to the enclosing class from an anonymous inner class in Java?
• Getting hold of the outer class object from the inner class object

Answer 1

DoAskForLaneClear(LanePair.this);

Since you can't use this (it will reference the TimerTask), but your anonymous class can't exist wihtout an instance of LanePair, that instance is referenced by LanePair.this

Answer 2

LanePair.class

?

Answer 3

I think you want either

DoAskForLaneClear(this);

or

this.DoAskForLaneClear();

I don't see where DoAskForLaneClear() is defined though.

Answer 4

I do this sometimes:

        public void startTimer() {
            status = LanePairStatus.TIMER_ON;
            **final LanePair lanePairRef = this;**
            timer.schedule(new TimerTask() {
                    public void run() {
                            DoAskForLaneClear(**lanePairRef**);
                    }
            }, 6000 ); // 6 seconds
    }

Answer 5

If you want to use in any case this word for example :)

import java.util.Timer;
import java.util.TimerTask;

public class Test
{      


    public void doAskForLaneClear(LanePair lanePair){
     //Action of lanePair
    }

    private class LanePair {      
     public int cameraNumber;        
     public Nest nest1, nest2;        
     public LanePairStatus status = LanePairStatus.TIMER_OFF;
     Timer timer = new Timer();    


      public LanePair(int cameraNumber, Nest nest1, Nest nest2) {
       this.cameraNumber = cameraNumber;            
       this.nest1 = nest1;         
       this.nest2 = nest2;
       startTimer();
      }      

      public void startTimer() {     
       status = LanePairStatus.TIMER_ON;     
       timer.schedule(new MyTimerTask(this), 6000 ); // 6 seconds       
      } 

            public void stopTimer() { 
        timer.cancel();   
           }

    }

    private class MyTimerTask extends TimerTask{

     private LanePair lanePair;

     public MyTimerTask(LanePair lanePair){
      this.lanePair = lanePair;
     }

     @Override
     public void run() {
      Test.this.doAskForLaneClear(lanePair);
     }

    }

}