package pizarra;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class   EventFrame extends JFrame

{

    public EventFrame()

    {

        setTitle("demostracion del uso  de eventos...");

        setSize(600,440);

        addWindowListener(new MainWindowListener());

        Container contenido = getContentPane();

        contenido.add(new ButtonPanel());

                

    }

}

class MainWindowListener extends WindowAdapter

{

    public void windowClosing(WindowEvent e) 

    {

System.exit(0);

}

}

    public class colores     

    {

      public static void main (String [] args)

      {

          JFrame frame = new EventFrame(); 

          frame.setVisible(true);

      }

      }

class ButtonPanel extends JPanel

implements ActionListener

{

    private JButton redButton;

    private JButton greenButton;

    private JButton blueButton;

    public ButtonPanel()

    {

        redButton = new JButton ("rojo");

        greenButton = new JButton("verde");

        blueButton = new  JButton("Azul");

        

        this.add(redButton);

        this.add(greenButton);

        this.add(blueButton);

        redButton.addActionListener(this);

        greenButton.addActionListener(this);

        blueButton.addActionListener(this);

    }

    public void actionPerformed (ActionEvent event)

    {

        Object source = event.getSource();

        Color color = getBackground();

        if (source == redButton)

            color = Color.RED;

        else if (source == greenButton)

            color = Color.GREEN;

        if (source == blueButton)

            color = Color.BLUE;

        setBackground(color);

        repaint();

    }

}

import java.awt.*;

public class grafico extends Panel{

    /*creates a new instance of Grafico*/

public grafico(){

}

 /** pinta el contenido grafico*/

public void paint(Graphics g){

g.setColor(Color.green);

 g.drawLine(25,25,275,75);

 g.setColor(Color.red);

 g.drawRect(25,50,50,75);

 g.fill3DRect(100,50,50,50 ,true);

 g.drawOval(175,50,50,50);

 GraphicsEnvironment ge = GraphicsEnvironment.getLocalGraphicsEnvironment();

 String[] fonts = ge.getAvailableFontFamilyNames();

 g.setFont(new Font(fonts[0],Font.PLAIN,12));

 g.drawString("rectangulo rojo",100,125);

 g.setFont(new Font(fonts[0],Font.BOLD,14));

 g.drawString("OVALO",200,125);

 g.setColor(Color.blue);

 int x[]= {250,275,300,325,350,375,400};

 int y[]= {75,50,75,50,75,50,75};

   g.drawPolygon(x,y,6);

}

public Dimension getPreferredSize(){

    return new Dimension(450,165);

}

public static void main(String[]arg){

    Frame f=new Frame("ejemplo de awt");

   

    f.add(new grafico());

   

    f.pack();

    f.setVisible(true);

}

}