Automatic Mouse Mover and Clicker

NaoEncheOSaco.java

import java.awt.*;
import java.awt.event.*;
import java.util.*;

public class NaoEncheOSaco {
    public static void main(String[] args) {
        final Toolkit toolkit = Toolkit.getDefaultToolkit();
        final Dimension screenSize = toolkit.getScreenSize();

        new Thread(() -> {
            System.out.println("Executando, pressione control+C para sair");
            while (true) {
                try {
                    Robot robot = new Robot();
                    robot.delay(500);
                    int x = (int)(Math.random() * screenSize.getWidth())  - 100;
                    int y = (int)(Math.random() * screenSize.getHeight()) - 100;
                    robot.mouseMove(50 + x, 50 + y);
                    robot.mousePress(InputEvent.BUTTON1_DOWN_MASK);
                    robot.delay(50);
                    robot.mouseRelease(InputEvent.BUTTON1_DOWN_MASK);
                } catch (Exception ex) { 
                    // continua rodando mesmo se tiver algum erro
                }
            }
        }).start();
    }
}

compilar:
javac NaoEncheOSaco.java

executar:
java NaoEncheOSaco