import java.awt.*;
import java.applet.*;
import java.awt.event.*;
public class ColorCircle extends Applet implements ActionListener
{	
  public Button bRed, bGreen;
  public Color myColor;
  public void init( )
  {
    bRed = new Button("RED");
    bRed.setBackground(Color.red);
    bRed.setForeground(Color.white);
    bGreen = new Button("GREEN");
    bGreen.setBackground(Color.green);
    bGreen.setForeground(Color.white);
    add(bRed);
    add(bGreen);
    bRed.addActionListener(this);
    bGreen.addActionListener(this);
    myColor = Color.white;
  }

  public void paint(Graphics g)
  {
    g.setColor(myColor);
    g.fillOval(50, 50, 50, 50);
  }

  public void actionPerformed(ActionEvent e)
  {
    if (e.getActionCommand().equals("RED"))
      myColor = Color.red;
    else if (e.getActionCommand().equals("GREEN"))
      myColor = Color.green;
    repaint();
  }
}

import java.awt.*;
import java.applet.*;
import java.awt.event.*;

public class Squares extends Applet implements ActionListener
{
    public Button bSquare;
    public TextField input;
    public Color myColor;
    public int num, numSquared;
    public void init( )
    {
	setBackground(Color.blue);
	setForeground(Color.yellow);
	bSquare = new Button("SQUARE");
	bSquare.setBackground(Color.red);
	bSquare.setForeground(Color.white);
	input = new TextField(20);
	input.setBackground(Color.yellow);
	input.setForeground(Color.black);
	input.setText("0");
	myColor = Color.white;
	num = 0;
	numSquared = 0;
	add(input);
	add(bSquare);
	bSquare.addActionListener(this);
    }
    public void paint(Graphics g)
    {
	g.setColor(myColor);
	g.drawString("" + numSquared, 100, 100);
    }
    public void actionPerformed(ActionEvent e)
    {
	num = Integer.parseInt(input.getText() );
	numSquared = num * num;
	repaint();
    }
}