GUI Test

Source Code

import java.awt.Button;
import java.awt.Choice;
import java.awt.Checkbox;
import java.awt.CheckboxGroup;
import java.awt.Label;
import java.awt.FlowLayout;
import java.awt.BorderLayout;
import java.awt.Panel;
import java.awt.TextField;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.ItemListener;
import java.awt.event.ItemEvent;
import java.applet.Applet;

public class GUItest extends Applet implements ActionListener, ItemListener {
  Button b1, b2;
  Label lb;
  Choice ch;
  CheckboxGroup cg;
  Checkbox cb1, cb2, cb3, cb4;
  TextField tf;

  public void init() {
    Panel p;

    setLayout(new BorderLayout());

    p = new Panel();
    ch = new Choice();
    ch.addItem("0");
    ch.addItem("10");
    ch.addItem("20");
    ch.addItem("30");
    ch.addItemListener(this);
    p.add(ch);

    cg = new CheckboxGroup();
    cb1 = new Checkbox("Learning", cg, true);
    cb1.addItemListener(this);
    cb2 = new Checkbox("Adaptive", cg, false);
    cb2.addItemListener(this);
    cb3 = new Checkbox("H infty", cg, false);
    cb3.addItemListener(this);
    cb4 = new Checkbox("Sliding Mode", cg, false);
    cb4.addItemListener(this);
    p.add(cb1); p.add(cb2); p.add(cb3); p.add(cb4);
    add("North", p);

    lb = new Label("Label", Label.CENTER);
    add("Center", lb);

    p = new Panel();
    b1 = new Button("Start");
    b1.setActionCommand("Start");
    b1.addActionListener(this);
    b2 = new Button("Stop ");
    b2.setActionCommand("Stop");
    b2.addActionListener(this);
    p.add(b1); p.add(b2);
    tf = new TextField(20);
    tf.addActionListener(this);
    p.add(tf);
    add("South", p);
  }
  public void itemStateChanged(ItemEvent evt) {
    if (evt.getSource() == ch) {
      lb.setText("Choice #" + ch.getSelectedIndex() + " Text ["
		 + ch.getSelectedItem() + "]");
    }
    else {
      lb.setText("CheckBox [" + evt.getItem().toString() + "]");
    }
  }
  public void actionPerformed(ActionEvent evt) {
    if (evt.getSource() == tf) {
      lb.setText("Text [" + tf.getText() + "]");
      tf.selectAll();
    }
    else {
      String command = evt.getActionCommand();
      lb.setText("Button [" + command + "]");
    }
  }
}