Small JAVA program to operate mouse from keyboard.

You can use all the functionality provided by mouse through keyboard.

I love JAVA and one of the reason is because it makes some complex tasks look very easy. I am going to use something called ROBOT class in java which is part of java.awt package.

Prerequisite knowledge:

• Very basic java, if you have made 3-4 simple JAVA program than you should be fine.
  To see about ROBOT class's official documentation see here .

• Should have java installed, I use eclipse IDE and I recommend it (It's free and opensource and really really awesome).

Difficulty of this tutorial:

Normal.

Lets get started:

First of all create a new java project and make the class which will have the function main() in it.

I named my class KeyboardAsMouse.java.

In the main function make a new instance of class robot class as:

Robot robot = new Robot();

Robot class has a function mouseMove(x,y), This function moves the pointer to (x,y) coordinate of the screen.

Taking Input:

I will use the arrow keys to take input and will use mouseMove(x,y) to move the mouse to x,y.

So, Input keys:

"Arrow keys"         To move the mouse

       "Space key"        For left click                 

"Control Key"         For right click

I am using a simple swing form to get input from keyboard, This can be done by using a KeyListener Like shown below:

	// A java frame
	JFrame guiFrame = new JFrame();
	//Key listener on that jform
	guiFrame.addKeyListener(new KeyListener() {
	@Override
	public void keyPressed(KeyEvent e) {

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Moving mouse:

To get current mouse position use following code:

Now all we have to do is move mouse, as I told earlier this can be done by robot.mouseMove() function. A case is shown below for up arrow:

	PointerInfo a = MouseInfo.getPointerInfo();
	Point b = a.getLocation();
	x = (int) b.getX();
	y = (int) b.getY();

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Mouse clicks:

For mouse click use function robot.mousePress(KeyCode). But, here is a catch; see mousePress() but it will keep on pressing, so you have to apply mouseRelease() just after mousePress().

	case KeyEvent.VK_SPACE:
	robot.mousePress(InputEvent.BUTTON1_MASK);
	robot.mouseRelease(InputEvent.BUTTON1_MASK);
	break;

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Putting this all together:

	import java.awt.AWTException;
	import java.awt.EventQueue;
	import java.awt.MouseInfo;
	import java.awt.Point;
	import java.awt.PointerInfo;
	import java.awt.Robot;
	import java.awt.event.InputEvent;
	import java.awt.event.KeyEvent;
	import java.awt.event.KeyListener;
	import javax.swing.JFrame;
	public class KeyboardAsMouse {
	Robot robot;
	int x = 50, y = 50;
	public static void main(String[] args) {
	EventQueue.invokeLater(new Runnable() {
	@Override
	public void run() {
	new KeyboardAsMouse();
	}
	});
	}
	public KeyboardAsMouse() {
	JFrame guiFrame = new JFrame();
	PointerInfo a = MouseInfo.getPointerInfo();
	Point b = a.getLocation();
	x = (int) b.getX();
	y = (int) b.getY();
	try {
	robot = new Robot();
	} catch (AWTException e1) {
	e1.printStackTrace();
	}
	guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	guiFrame.setTitle("Mouse");
	guiFrame.setSize(50, 50);
	guiFrame.setLocationRelativeTo(null);
	guiFrame.addKeyListener(new KeyListener() {
	@Override
	public void keyPressed(KeyEvent e) {
	int key = e.getKeyCode();
	PointerInfo a = MouseInfo.getPointerInfo();
	Point b = a.getLocation();
	x = (int) b.getX();
	y = (int) b.getY();
	switch (key) {
	case KeyEvent.VK_UP:
	robot.mouseMove(x, y - 10);
	y -= 10;
	break;
	case KeyEvent.VK_DOWN:
	robot.mouseMove(x, y + 10);
	y += 10;
	break;
	case KeyEvent.VK_LEFT:
	robot.mouseMove(x - 10, y);
	x -= 10;
	break;
	case KeyEvent.VK_RIGHT:
	robot.mouseMove(x + 10, y);
	x += 10;
	break;
	case KeyEvent.VK_SPACE:
	robot.mousePress(InputEvent.BUTTON1_MASK);
	robot.mouseRelease(InputEvent.BUTTON1_MASK);
	break;
	case KeyEvent.VK_CONTROL:
	robot.mousePress(InputEvent.BUTTON3_MASK);
	robot.mouseRelease(InputEvent.BUTTON3_MASK);
	break;
	}
	}
	@Override
	public void keyReleased(KeyEvent e) {
	}
	@Override
	public void keyTyped(KeyEvent e) {
	}
	});
	guiFrame.setAlwaysOnTop(true);
	guiFrame.setLocationByPlatform(true);
	guiFrame.setVisible(true);
	}
	}

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Thank You Guys, in case of any query or advise comment, feel free to mail me.
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