Curriculum

Learn Java Programming

Chapter 0: Computer Language Generations and Environment Setup

0/4

Chapter 1: Introduction to Java

0/6

Chapter 2: Java Data Types, Tokens and Variables

0/5

Chapter 3: Working with User Input in Java

0/6

Chapter 4: Java Operators and Expressions

0/9

Chapter 5: Understanding Control Statements in Java

0/8

Chapter 6: Working with Wrapper Classes Arrays in Java

0/6

Chapter 7: Understanding Classes and Methods in Java Part 1

0/9

Chapter 8: Understanding Constructors and Encapsulation in Java

0/8

Chapter 8: Understanding Methods and Objects in Java Part 2

0/5

Chapter 9: Working with Inheritance and Polymorphism in Java

0/11

Chapter 10: Working with Package, Abstract Class and Interface in Java

0/9

Chapter 11: String Handling in Java

0/5

Chapter 12: Understanding Error and Exception Handling in Java

0/13

Chapter 13: Working with I/O Stream Classes and File Handling in Java

0/10

Chapter 14: Working with Multithreading in Java

0/11

Chapter 15: Working with Generics

0/4

Chapter 16: Working with Collection Frameworks

0/8

Chapter 17: Working with AWT and Swings in Java

0/17

Chapter 18: Event Handling in Java

0/4

Chapter 19: Working with JDBC in Java - Part 1

0/11

Chapter 20: Working with JDBC in Java - Part 2

0/2

Text lesson

Implementing the Mouse Event using MouseListener and MouseMotionListener in Java

[post-views]

In this lesson, you will learn.

MouseEvent Class
MouseListener Interface
Examples

To handle mouse events, you must implement the MouseListener and the MouseMotionListener interfaces.

MouseEvent Class

MouseEvent is a class that encapsulates information about mouse events, such as mouse clicks, movements, and button actions.
It provides methods to get details about the event, such as the cursor’s location, where the mouse button was pressed, and the number of clicks.

MouseEvent Methods

Method	Description
`int getX()`	Returns the x-coordinate of the mouse event relative to the source component.
`int getY()`	Returns the y-coordinate of the mouse event relative to the source component.
`Point getPoint()`	Returns the `Point` object representing the x and y coordinates of the mouse event.
`int getButton()`	Returns which, if any, of the mouse buttons has changed state.
`int getClickCount()`	Returns the number of mouse clicks associated with the event.

MouseListener Interface

MouseListener is an interface that listens for mouse events. It has five methods that must be implemented.

MouseListener Methods

Method	Description
`void mouseClicked(MouseEvent e)`	Invoked when the mouse button has been clicked (pressed and released) on a component.
`void mousePressed(MouseEvent e)`	Invoked when a mouse button has been pressed on a component.
`void mouseReleased(MouseEvent e)`	Invoked when a mouse button has been released on a component.
`void mouseEntered(MouseEvent e)`	Invoked when the mouse enters a component.
`void mouseExited(MouseEvent e)`	Invoked when the mouse exits a component.

Example: Implementing MouseListener Methods

package mouseeventhandling;

import javax.swing.*;
import java.awt.event.*;

public class MouseListenerExample extends JFrame implements MouseListener {

	private JLabel label;

	public MouseListenerExample() {
		// Set up the frame
		setTitle("MouseListener Example");
		setSize(400, 300);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(null);

		// Set up the label
		label = new JLabel("Mouse events will be displayed here");
		label.setBounds(50, 100, 300, 50);
		add(label);

		// Add MouseListener to the frame
		addMouseListener(this);
	}

	@Override
	public void mouseClicked(MouseEvent e) {
		label.setText("Mouse Clicked at (" + e.getX() + ", " + e.getY() + ")");
	}

	@Override
	public void mousePressed(MouseEvent e) {
		label.setText("Mouse Pressed at (" + e.getX() + ", " + e.getY() + ")");
	}

	@Override
	public void mouseReleased(MouseEvent e) {
		label.setText("Mouse Released at (" + e.getX() + ", " + e.getY() + ")");
	}

	@Override
	public void mouseEntered(MouseEvent e) {
		label.setText("Mouse Entered at (" + e.getX() + ", " + e.getY() + ")");
	}

	@Override
	public void mouseExited(MouseEvent e) {
		label.setText("Mouse Exited at (" + e.getX() + ", " + e.getY() + ")");
	}

	public static void main(String[] args) {
		MouseListenerExample example = new MouseListenerExample();
		example.setVisible(true);
	}
}

Output:

Explanation

Imports:
- javax.swing.*: For Swing components like JFrame and JLabel.
- java.awt.event.*: For event handling, including MouseListener and MouseEvent.
Class Declaration:
- MouseListenerExample class extends JFrame and implements MouseListener.
Constructor:
- Sets up the JFrame with a title, size, close operation, and layout.
- Adds a JLabel to display mouse events.
- Registers the class as a mouse listener to the JFrame using addMouseListener(this).
Override MouseListener Methods:
- Each method updates the JLabel with the event type and the coordinates of the mouse pointer when the event occurs.
Main Method:
- Call the class.

Example-2: Implement MouseMotionListener

Methods of MouseMotionListener

Method	Description
`void mouseDragged(MouseEvent e)`	Called when a mouse button is pressed and the mouse is dragged.
`void mouseMoved(MouseEvent e)`	Called when the mouse is moved with no buttons pressed.

package mouseeventhandling;

import javax.swing.*;
import java.awt.event.*;

public class MouseMotionListenerExample extends JFrame 
implements MouseMotionListener {

	private JLabel label;

	public MouseMotionListenerExample() {
		// Set up the frame
		setTitle("MouseMotionListener Example");
		setSize(300, 300);
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setLayout(null);

		// Set up the label
		label = new JLabel("Move the mouse within the frame");
		label.setBounds(50, 100, 300, 50);
		add(label);

		// Add MouseMotionListener to the frame
		addMouseMotionListener(this);
	}

	@Override
	public void mouseDragged(MouseEvent e) {
		label.setText("Mouse Dragged to (" + e.getX() + ", " + e.getY() + ")");
	}

	@Override
	public void mouseMoved(MouseEvent e) {
		label.setText("Mouse Moved to (" + e.getX() + ", " + e.getY() + ")");
	}

	public static void main(String[] args) {

		MouseMotionListenerExample example = new MouseMotionListenerExample();
		example.setVisible(true);
	}
}

Output

End of the lesson….enjoy learning

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Curriculum

Learn Java Programming

Chapter 0: Computer Language Generations and Environment Setup

Chapter 1: Introduction to Java

Chapter 2: Java Data Types, Tokens and Variables

Chapter 3: Working with User Input in Java

Chapter 4: Java Operators and Expressions

Chapter 5: Understanding Control Statements in Java

Chapter 6: Working with Wrapper Classes Arrays in Java

Chapter 7: Understanding Classes and Methods in Java Part 1

Chapter 8: Understanding Constructors and Encapsulation in Java

Chapter 8: Understanding Methods and Objects in Java Part 2

Chapter 9: Working with Inheritance and Polymorphism in Java

Chapter 10: Working with Package, Abstract Class and Interface in Java

Chapter 11: String Handling in Java

Chapter 12: Understanding Error and Exception Handling in Java

Chapter 13: Working with I/O Stream Classes and File Handling in Java

Chapter 14: Working with Multithreading in Java

Chapter 15: Working with Generics

Chapter 16: Working with Collection Frameworks

Chapter 17: Working with AWT and Swings in Java

Chapter 18: Event Handling in Java

Chapter 19: Working with JDBC in Java - Part 1

Chapter 20: Working with JDBC in Java - Part 2

Implementing the Mouse Event using MouseListener and MouseMotionListener in Java

MouseEvent Class

MouseEvent Methods

MouseListener Interface

MouseListener Methods

Example: Implementing MouseListener Methods

Output:

Explanation

Example-2: Implement MouseMotionListener

Methods of MouseMotionListener

End of the lesson….enjoy learning

Student Ratings and Reviews

Submit a Review