Java-Programming-Exercises/SimpleGui1B.java at master · RoyTien/Java-Programming-Exercises · GitHub

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import javax.swing.*;

import java.awt.event.*;

import java.awt.*;

public class SimpleGui1B implements ActionListener{

//JButton button;

public static void main(String[] args){

SimpleGui1B gui = new SimpleGui1B();

//gui.go();

}

public void go(){

JFrame frame = new JFrame();

button = new JButton("click me");

button.addActionListener(this);

frame.getContentPane().add(button);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(300,300);

frame.setVisible(true);

}

public void actionPerformed(ActionEvent event){

button.setText("I've been clicked");

}

public void paintComponent(Graphics g){

//g.setColor(Color.blue);

g.fillRect(0,0,this.getWidth(),this.getHeight());

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

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

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

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

g.setColor(randomColor);

g.fillOval(70,70,100,100);

}

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