Abrir una ventana desde otra ventana

Como se puede ver, la ventana
aparece con un borde mínimo y la etiqueta de control que visualiza un mensaje.

package masterdavidjavabasico;

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


public class ventana 
{
    public static void main(String [] args)
    {
       AppFrame f = new AppFrame();

       f.setSize(200, 200);

       f.addWindowListener(new WindowAdapter() { public void
           windowClosing(WindowEvent e) {System.exit(0);}});

       f.show();
    }
}

class AppFrame extends Frame implements ActionListener
{
    Button b1, b2;
    labelWindow window;

    AppFrame()
    {
        setLayout(new FlowLayout());
        b1 = new Button("Visualizar la ventana");
        add(b1);
        b1.addActionListener(this);

        b2 = new Button("Ocultar la ventana");
        add(b2);
        b2.addActionListener(this);

        window = new labelWindow(this);
        window.setSize(300, 200);
        window.setLocation(300, 200);
    }

    public void actionPerformed(ActionEvent event)
    {
        if(event.getSource() == b1){
            window.setVisible(true);
        }
        if(event.getSource() == b2){
            window.setVisible(false);
        }
    }
}

class labelWindow extends Window {
    Label label;

    labelWindow(AppFrame af){
        super(af);
        setLayout(new FlowLayout());
        label = new Label("Hola desde Java!");
        add(label);
    }

    public void paint (Graphics g)
    {
        int width = getSize().width;
        int height = getSize().height;

        g.drawRect(0, 0, --width, --height);
    }
}

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();
    }
}

multiplicadora usando cuadros de texto y un boton en un applet de java

package masterdavidjavabasico;

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

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

public class multiplicadora extends Applet implements ActionListener {

    TextField text1, text2, answertext;
    Label multiplylabel;
    Button button1;

    public void init()
    {
        text1 = new TextField(10);
        add(text1);

        multiplylabel = new Label("*");
        add(multiplylabel);

        text2 = new TextField(10);
        add(text2);

        button1 = new Button("=");
        add(button1);
        button1.addActionListener(this);
                    
        answertext = new TextField(10);
        add(answertext);
    }

    public void actionPerformed(ActionEvent e) {
        if(e.getSource() == button1){
            //int sum = Integer.parseInt(text1.getText()) + Integer.parseInt(text2.getText());
            //answertext.setText(String.valueOf(sum));
            int product = Integer.parseInt(text1.getText()) * Integer.parseInt(text2.getText());
            answertext.setText(String.valueOf(product));
        }
    }

}

boton de opcion y cudro de texto en un applet de java

package masterdavidjavabasico;

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

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

public class botondeopcion extends Applet implements ItemListener {

    CheckboxGroup radios;
    Checkbox radio1, radio2, radio3, radio4;
    TextField text1;

    public void init()
    {
        radios = new CheckboxGroup();

        radio1 = new Checkbox("1", false, radios);
        add(radio1);
        radio1.addItemListener(this);

        radio2 = new Checkbox("2", false, radios);
        add(radio2);
        radio2.addItemListener(this);

        radio3 = new Checkbox("3", false, radios);
        add(radio3);
        radio3.addItemListener(this);

        radio4 = new Checkbox("4", false, radios);
        add(radio4);
        radio4.addItemListener(this);

        text1 = new TextField(25);
        add(text1);
    }

    public void itemStateChanged(ItemEvent e)
    {
        text1.setText("Boton de opcion " + ((Checkbox) e.getItemSelectable()).getLabel() + " pulsado!");
    }
}

Video aun no suvido...