Getting started with GUI programming in Java_2

Feb 1, 20130 likes368 views

This document provides an overview of various GUI components in Java including labels, images, buttons, text fields, text areas, combo boxes, check boxes and menus. It demonstrates how to create and configure each component, such as adding images and event listeners to buttons, handling key listeners for text fields, creating arrays of text fields, and displaying selectable options in combo boxes. The document concludes with a task to build a full calculator application using these various GUI elements.

GETTING STARTED WITH GUI PROGRAMMING 2

By .Muhammad Shebl

OBJECTIVES
1. Labels & Images
2. Buttons
3. Text Fields & Text Area
4. Combo Boxes
5. Check box
6. Set bounds layout
7. Pack() & setResizable()
8. Menus

Labels :
 JLabel lab=new JLabel(“MUFIX”);

 ImageIcon icon = new ImageIcon("sigin.png");
JLabel lab=new JLabel(icon );

BUTTONS :
 Adding Event :
 JButton jbt = new JButton("OK");
 jbt.addActionListener(this );

 Add icon image :
 ImageIcon icon = new
ImageIcon("sigin.png");
 JButton jbt = new JButton(icon);

BUTTONS :
Roll over icon :
 ImageIcon icon = new
ImageIcon("sigin.png");
 JButton jbt = new JButton(icon);
 Jbt.setRolloverIcon(icon);

BUTTONS:
Roll Pressedicon :

ImageIcon icon = new
ImageIcon("sigin.png");
JButton jbt = new JButton(icon);
jbt.setPressedIcon(icon);

TEXT AREA
 If you want to let the user enter multiple
lines of text, you have to create several
instances of JTextField. A better alternative
is to use JTextArea, which enables the user
to enter multiple lines of text.

 JTextArea jtaNote = new JTextArea(5, 20);

TEXT FIELDS KEY LISTNERS :
// Create a text field with text "Type Name Here"
JTextField jtfName = new JTextField("Type Name Here");

jtfName .addKeyListener(this);

Array of Text Fields
 You can create Array of Text fields by:

 JTextField[][] txt = new JTextField[x][y];

 for (int i = 0; i < x; i++) {

 for (int j = 0; j < y; j++) {

 txt[i][j] = new JTextField(10);

 panel.add(txt[i][j]);

txt[i][j].setHorizontalAlignment(JTextField.CENTER);

 if (i == j) {

 txt[i][j].setText("1");

 txt[i][j].setEditable(false);

 } txt[i][j].addKeyListener(this);

 }}

$Combo box  To Create Combo box :  JComboBox operations_txt= new JComboBox(new String[]{"<=", "=", ">="}); Operation_txt. getSelectedItem();$

Check box :
// Create a check box with text bold
JCheckBox jchkBold = new JCheckBox("Bold");

 jchkBold.addActionListener(new ActionListener() {

 public void actionPerformed(ActionEvent e) {
 if (jchkBold.isSelected()) {
 // your Action
 }
 }
 });

$Combo box  To Create Combo box :  JComboBox operations_txt= new JComboBox(new String[]{"<=", "=", ">="}); Operation_txt. getSelectedItem();$

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