Java Code : Take Screenshot, Schedule Program, Send Mail.
1. Take Screenshot:
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import java.awt.AWTException;
import java.awt.Rectangle;
import java.awt.Robot;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.util.Date;
import javax.imageio.ImageIO;
public class RobotExp {
    
    public static void main(String[] args) {
        
        try {
            Date a = new Date();
            Robot robot = new Robot();
            // Capture the screen shot of the area of the screen defined by the rectangle
            BufferedImage bi=robot.createScreenCapture(new Rectangle(1000,1000));
            ImageIO.write(bi, "jpg", new File("D:/tt/imageTest.jpg"));
            
        } catch (AWTException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}
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2. Schedule Program
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 import java.awt.Toolkit;
import java.util.Timer;
import java.util.TimerTask;
/**
 * Simple demo that uses java.util.Timer to schedule a task to execute once 5
 * seconds have passed.
 */
public class ReminderBeep {
  Toolkit toolkit;
  Timer timer;
  public ReminderBeep(int seconds) {
    toolkit = Toolkit.getDefaultToolkit();
    timer = new Timer();
    timer.schedule(new RemindTask(), seconds * 1000);
  }
  class RemindTask extends TimerTask {
    public void run() {
      System.out.println("Time's up!");
      toolkit.beep();
      String args[] = new String[3];
      main(args);
      //timer.cancel(); //Not necessary because we call System.exit
      //System.exit(0); //Stops the AWT thread (and everything else)
    }
  }
  public static void main(String args[]) {
    System.out.println("About to schedule task.");
    new ReminderBeep(5);
    System.out.println("Task scheduled.");
  }
}
     
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3. Send Mail
For this we need 2 Jars:
   a. javax.mail.jar
   b. activation-1.0.2.jar
Then we need: SMTP host, port
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import java.util.*;
import javax.mail.*;
import javax.mail.internet.*;
import javax.activation.*;
public class SendFileEmail
{
   public static void main(String [] args)
   {
      
      // Recipient's email ID needs to be mentioned.
      String to = "pavan.x.mr@oracle.com";
      // Sender's email ID needs to be mentioned
      String from = "web@gmail.com";
      // Assuming you are sending email from localhost
      String host = "localhost";
      // Get system properties
      Properties properties = System.getProperties();
      // Setup mail server
      properties.setProperty("mail.smtp.host", host);
      properties.setProperty("mail.smtp.port", "465");
      // Get the default Session object.
      Session session = Session.getDefaultInstance(properties);
      try{
         // Create a default MimeMessage object.
         MimeMessage message = new MimeMessage(session);
         // Set From: header field of the header.
         message.setFrom(new InternetAddress(from));
         // Set To: header field of the header.
         message.addRecipient(Message.RecipientType.TO,
                                  new InternetAddress(to));
         // Set Subject: header field
         message.setSubject("This is the Subject Line!");
         // Create the message part 
         BodyPart messageBodyPart = new MimeBodyPart();
         // Fill the message
         messageBodyPart.setText("This is message body");
         
         // Create a multipar message
         Multipart multipart = new MimeMultipart();
         // Set text message part
         multipart.addBodyPart(messageBodyPart);
         // Part two is attachment
         messageBodyPart = new MimeBodyPart();
         String filename = "file.txt";
         DataSource source = new FileDataSource(filename);
         messageBodyPart.setDataHandler(new DataHandler(source));
         messageBodyPart.setFileName(filename);
         multipart.addBodyPart(messageBodyPart);
         // Send the complete message parts
         message.setContent(multipart );
         // Send message
         Transport.send(message);
         System.out.println("Sent message successfully....");
      }catch (MessagingException mex) {
         mex.printStackTrace();
      }
   }
}
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