Graphical User Interfaces - Building Java Programs: A Back to Basics Approach - page 860

Table 14.9 Useful Methods of MouseEvent Objects

public int getButton()
Returns the number of the mouse button that was pressed or released (1 for the left button, 2 for
the right button, and so on).

public int getClickCount()
Returns the number of times the user clicked the button. This method is useful for detecting
double-clicks.

public Point getPoint()
Returns the ( x, y ) point where the mouse event occurred.

public int getX()
Returns the x -coordinate where the mouse event occurred.

public int getY()
Returns the y -coordinate where the mouse event occurred.

For example, the mouse listener that follows could be attached to any component,
even the frame itself. It would make a message appear any time the user pressed the
mouse button:

1 // Responds to a mouse click by showing a message
2 // that indicates where the user clicked
3
4 import java.awt.event.*;
5 import javax.swing.*;
6 import javax.swing.event.*;
7
8 public class ClickListener extends MouseInputAdapter {
9 public void mousePressed(MouseEvent event) {
10 JOptionPane.showMessageDialog( null ,
11 "Mouse pressed at position ("
12 + event.getX() + ", " + event.getY() + ")");
13 }
14 }

As another example, the program that follows uses a mouse listener to set a
label's text to show the mouse's position as it moves over the label. Like the GUIs
in our previous examples, this GUI is object-oriented and serves as its own
listener:

1 // A GUI that displays the position of the mouse over a label.
2
3 import java.awt.*;
4 import java.awt.event.*;