Java 使用 awt 运行时鼠标单击不起作用 Canvas

Question

For a Java program, I need to detect the click of a mouse. I imported import java.awt.event.*; . And ran this:

    public void mouseClicked(MouseEvent e) 
{
    if (e.getButton() == MouseEvent.BUTTON1) 
    {
        System.out.println("Click position (X, Y):  " + e.getX() + ", " + e.getY());
    }
}

When this is run, I don't get any output when I click on the screen.

This is what the start of my class looks like:

class Drawing extends Canvas implements MouseListener, MouseMotionListener{

I am not sure why this is happening. I am on mac and another post ( JAVA mouseClicked event doesnt get fired on the Mac ) suggests that there might be something wrong with using a mac.

Answer 1

As per https://docs.oracle.com/javase/tutorial/uiswing/events/mouselistener.html

The listener needs to be added to a component eg a button, panel etc.

public class MouseEventDemo implements MouseListener {
    //where initialization occurs:
    //Register for mouse events on blankArea and the panel.
    blankArea.addMouseListener(this);
    addMouseListener(this);
...


public void mouseClicked(MouseEvent e) {
   System.out.println ("Mouse clicked (# of clicks: "
                + e.getClickCount() + ")", e);
}