identifying double click in java

Question

public void mouseClicked(MouseEvent event)
{
  if (event.getClickCount() == 2 && event.getButton() == MouseEvent.BUTTON1) {
    System.out.println("double clicked");
  }
}

Assuming you mean in Swing, assign a MouseListener to your Component:

addMouseListener(new MouseAdapter(){
    @Override
    public void mouseClicked(MouseEvent e){
        if(e.getClickCount()==2){
            // your code here
        }
    }
});

Reference:

• Java Tutorial: How to write a Mouse Listener

The e.getClickCount()==2 is not enough if you want to allow your users to do multiple double clicks in a short delay. You are limited by the desktop configuration. You can get it by looking the result of Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval");

A good way to bypass the problem is not to use the getClickCount() check but to use a Timer where you can choose the interval max between your clicks and to handle by oneself the count (very simple).

The code associated :

boolean isAlreadyOneClick;

@Override
public void mouseClicked(MouseEvent mouseEvent) {
    if (isAlreadyOneClick) {
        System.out.println("double click");
        isAlreadyOneClick = false;
    } else {
        isAlreadyOneClick = true;
        Timer t = new Timer("doubleclickTimer", false);
        t.schedule(new TimerTask() {

            @Override
            public void run() {
                isAlreadyOneClick = false;
            }
        }, 500);
    }
}

Tested with Win Xp OS and perfect.