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The example here show us how to get the color of a pixel in the screen. We use the Robot.getPixelColor(int x, int y) method to obtain the Color of the pixel.

import java.awt.Color;
import java.awt.Robot;
import java.awt.AWTException;

public class ColorPickerDemo {
public static void main(String[] args) {
try {
Robot robot = new Robot();

//
// The the pixel color information at 20, 20
//
Color color = robot.getPixelColor(20, 20);

//
// Print the RGB information of the pixel color
//
System.out.println("Red = " + color.getRed());
System.out.println("Green = " + color.getGreen());
System.out.println("Blue = " + color.getBlue());

} catch (AWTException e) {
e.printStackTrace();
}
}
}