如何将值从JPanel传递到NetBeans中的JFrame

Question

I have the following method in my JPanel:

public void detectionTime(){
      detectStartTime = System.currentTimeMillis();
      long detectDuration = System.currentTimeMillis() - detectStartTime;
      performance.lblDetectTime.setText(detectDuration + "ms");
  }

I want to print or output the detectDuration variable in a label ie lblDetectTime in a JFrame. I have created an instance of the JFrame as "performance" and I have also created an instance of the JPanel into the JFrame in order to access the method.

Answer 1

Why pass, when you can directly set it.............

If still you want to pass it... then change the return type of detectionTime() method in JPanel.

public String detectionTime(){

detectStartTime = System.currentTimeMillis();
long detectDuration = System.currentTimeMillis() - detectStartTime;
return detectDuration + "ms";

 }

Edited Again:

Do this from class that extends the JFrame (ie your container)

IblDetectTime.setText(MyPanel.detectionTime());