Capture screen using java.awt.Robot

Java example to capture screen using java.awt.Robot:

package javarobotcapturescreen;

import java.awt.AWTException;
import java.awt.Dimension;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.Toolkit;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.imageio.ImageIO;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaRobotCaptureScreen {

    public static void main(String[] args) {
        try {
            Robot robot = new Robot();
            
            Toolkit myToolkit = Toolkit.getDefaultToolkit();
            Dimension screenSize = myToolkit.getScreenSize();
            
            Rectangle screen = new Rectangle(screenSize);
            
            BufferedImage screenFullImage = robot.createScreenCapture(screen);
            ImageIO.write(screenFullImage, "jpg", new File("screen.jpg"));
            
        } catch (AWTException | IOException ex) {
            Logger.getLogger(JavaRobotCaptureScreen.class.getName()).log(Level.SEVERE, null, ex);
        }
    }
    
}

captured screen:

Get screen size and resolution, with java.awt.Toolkit

Java example to get screen size and resolution, with java.awt.Toolkit:

package javagetscreensize;

import java.awt.Dimension;
import java.awt.Toolkit;

/**
 *
 * @web http://java-buddy.blogspot.com/
 */
public class JavaGetScreenSize {

    public static void main(String[] args) {
        Toolkit myToolkit = Toolkit.getDefaultToolkit();
        Dimension screenSize = myToolkit.getScreenSize();
        int screenResolution = myToolkit.getScreenResolution();
        System.out.println("Screen size = " + screenSize.width + " x " + screenSize.height);
        System.out.println("Screen Resolution: " + screenResolution + " dots-per-inch");
    }
    
}

Example of using KeyListener

Example to implement KeyListener for Swing UI elements.

Example of using KeyListener

package javamyframe;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaMyFrame extends JFrame 
    implements KeyListener{

    JTextArea textArea;
    JButton buttonClear;
    
    String s = "";
    
    public static void main(String[] args) {
        
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        JavaMyFrame myFrame = new JavaMyFrame();

        myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        myFrame.prepareUI();

        myFrame.pack();
        myFrame.setVisible(true);
    }
    
    private void prepareUI(){
        textArea = new JTextArea();
        textArea.setEditable(false);
        textArea.addKeyListener(this);
        JScrollPane panel = new JScrollPane(textArea);
        panel.setPreferredSize(new Dimension(300, 100));
        
        buttonClear = new JButton("Clear");
        buttonClear.addActionListener(anotherActionListener);
        
        getContentPane().add(panel, BorderLayout.CENTER);
        getContentPane().add(buttonClear, BorderLayout.PAGE_END);
    }
    
    ActionListener anotherActionListener = new ActionListener(){

        @Override
        public void actionPerformed(ActionEvent e) {
            s = "";
            textArea.setText(s);
        }
        
    };

    @Override
    public void keyTyped(KeyEvent e) {
        s += e.getKeyChar();
        textArea.setText(s);
    }

    @Override
    public void keyPressed(KeyEvent e) {}

    @Override
    public void keyReleased(KeyEvent e) {}
}

Related: Example of using ActionListener

Example of using ActionListener

Example to implement ActionListener for Swing UI elements.

Example of using ActionListener

package javamyframe;

import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.SwingUtilities;

/**
 * @web http://java-buddy.blogspot.com/
 */
public class JavaMyFrame extends JFrame 
    implements ActionListener{

    JTextArea textArea;
    JButton button1, button2;
    
    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

    private static void createAndShowGUI() {
        JavaMyFrame myFrame = new JavaMyFrame();

        myFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        
        myFrame.prepareUI();

        myFrame.pack();
        myFrame.setVisible(true);
    }
    
    private void prepareUI(){
        textArea = new JTextArea();
        textArea.setEditable(false);
        JScrollPane panel = new JScrollPane(textArea);
        panel.setPreferredSize(new Dimension(300, 100));
        
        button1 = new JButton("My Button 1");
        button1.addActionListener(this);
        button2 = new JButton("My Button 2");
        button2.addActionListener(anotherActionListener);
        
        getContentPane().add(panel, BorderLayout.CENTER);
        getContentPane().add(button1, BorderLayout.PAGE_START);
        getContentPane().add(button2, BorderLayout.PAGE_END);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        textArea.setText(e.getActionCommand());
    }
    
    ActionListener anotherActionListener = new ActionListener(){

        @Override
        public void actionPerformed(ActionEvent e) {
            textArea.setText("anotherActionListener: " 
                    + e.getActionCommand());
        }
        
    };
}

Related: Example of using KeyListener