Como usar una grid bag layout en un applet de java

Veamos un ejemplo de cómo funciona un grid bag layout.

package masterdavidjavabasico;

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

/*
<APPLET
    CODE=gridbag.class
    WIDTH=400
    HEIGHT=80 >
</APPLET>
*/

public class gridbag extends Applet implements ActionListener
{
    Button button1, button2, button3;
    TextField text1;

    public void init()
    {
        GridBagLayout gridbag = new GridBagLayout();
        GridBagConstraints constraints = new GridBagConstraints();
        setLayout(gridbag);
        constraints.weighty = 1;
        constraints.fill = GridBagConstraints.BOTH;

        constraints.weightx = 1;
        button1 = new Button("Boton 1");
        gridbag.setConstraints(button1, constraints);
        button1.setActionCommand("boton 1");
        add(button1);
        button1.addActionListener(this);

        constraints.weightx = 2;
        button2 = new Button("Boton 2");
        gridbag.setConstraints(button2, constraints);
        button2.setActionCommand("boton 2");
        add(button2);
        button2.addActionListener(this);

        constraints.weightx = 1;
        button3 = new Button("Boton 3");
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridbag.setConstraints(button3, constraints);
        button3.setActionCommand("boton 3");
        add(button3);
        button3.addActionListener(this);

        text1 = new TextField();
        constraints.gridwidth = GridBagConstraints.REMAINDER;
        gridbag.setConstraints(text1, constraints);
        add(text1);
    }

    public void actionPerformed(ActionEvent e)
    {
        text1.setText("Hizo clic sobre " + ((Button) e.getSource()).getActionCommand());
    }                 
}

Otra forma de darle o indicarle una accion a un boton en un applet de java.

package masterdavidjavabasico;

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

/*
<APPLET
    CODE=card.class
    WIDTH=200
    HEIGHT=200 >
</APPLET>
*/

class cardPanel extends Panel
{
    Button button;
    Label label;

    cardPanel(card applet, String cardnumber)
    {
        button = new Button("Tarjeta siguiente");
        button.addActionListener(applet);
        add(button);
        label = new Label("Esta es la tarjeta n� " + cardnumber);
        add(label);
    }
}


public class card extends Applet implements ActionListener
{
    int index = 1;
    CardLayout cardlayout;
    cardPanel panel1, panel2, panel3;

    public void init()
    {
        cardlayout = new CardLayout();
        setLayout(cardlayout);

        panel1 = new cardPanel(this, "uno");
        panel2 = new cardPanel(this, "dos");
        panel3 = new cardPanel(this, "tres");

        add("primero", panel1);
        add("segundo", panel2);
        add("tercero", panel3);

        cardlayout.show(this, "primero");
    }

    public void actionPerformed(ActionEvent event)
    {
        switch(++index){
            case 1:
                cardlayout.show(this, "primero");
                break;
            case 2:
                cardlayout.show(this, "segundo");
                break;
            case 3:
                cardlayout.show(this, "tercero");
                break;
        }
        if(index == 3) index = 0;
        repaint();
    }
}

Poner Un boton con accion en un applet de Java

package masterdavidjavabasico;
import java.applet.Applet;
import java.awt.*;
import java.awt.event.*;
public class boton extends Applet implements ActionListener {
/*
<APPLET
    CODE=boton.class
    WIDTH=200
    HEIGHT=200 >
</APPLET>
*/
    TextField text1;
    Button button1;
    public void init()
    {
        text1 = new TextField(20);
        add(text1);
        button1 = new Button("Haga clic aqui!");
        add(button1);
        button1.addActionListener(this);
    }
    public void actionPerformed(ActionEvent event)
    {
        String msg = new String ("Hola desde Java!");
        if(event.getSource() == button1){
            text1.setText(msg);
        }
    }
}


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