对于Java程序，我需要检测鼠标的单击。我导入了import java.awt.event.*;。并运行：
public void mouseclicked(MouseEvent e)
{
if (e.getButton() == MouseEvent.BUTTON1)
{
System.out.println("Click position (X,Y): " + e.getX() + "," + e.getY());
}
}
运行此命令时，单击屏幕时没有任何输出。
这是我课程开始的样子：
class Drawing extends Canvas implements MouseListener,MouseMotionListener{
我不确定为什么会这样。我在Mac上，另一则帖子（JAVA mouseClicked event doesnt get fired on the Mac）暗示使用Mac可能有问题。
按照https://docs.oracle.com/javase/tutorial/uiswing/events/mouselistener.html
侦听器需要添加到组件中，例如按钮，面板等。
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);
}