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PaintablePanel.java

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package javaGUItesting;

import java.awt.Color;

import java.awt.GradientPaint;

import java.awt.Graphics;

import java.awt.Graphics2D;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import javax.swing.JPanel;

@SuppressWarnings("serial")

public class PaintablePanel extends JPanel implements ActionListener {

public void paintComponent(Graphics g){

Graphics2D g2 = (Graphics2D) g;

int red = (int) (Math.random() * 255);

int green = (int) (Math.random() * 255);

int blue = (int) (Math.random() * 255);

Color startColor = new Color(red, green, blue);

red = (int) (Math.random() * 255);

green = (int) (Math.random() * 255);

blue = (int) (Math.random() * 255);

Color endColor = new Color(red, green, blue);

GradientPaint gradient = new GradientPaint(70, 170, startColor, 170, 170, endColor);

g2.setPaint(gradient);

g2.fillRect(70, 70, 100, 100);

}

@Override

public void actionPerformed(ActionEvent e) {

// TODO Auto-generated method stub

}

}