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Java Programming
Topic No. 12 : GUI Programming in Java
About AWT and Swing Packages
will be updated soon.
Basic Example of GUI
Source Code of main class
package javaapplication1;
public class JavaApplication1 {
public static void main(String[] args) {
Pra1GUI t = new Pra1GUI();
t.setSize(500, 500);
t.setVisible(true);
}
}
Source Code for GUI
public class Pra1GUI extends JFrame implements ActionListener {
JButton jb1;
Pra1GUI()
{
jb1 = new JButton("OK");
jb1.setBackground(Color.red);
setLayout(new FlowLayout());
add(jb1);
jb1.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource() == jb1)
{
System.out.print("Hello World");
JOptionPane.showMessageDialog(this, "Hello World","NUV",JOptionPane.INFORMATION_MESSAGE);
}
}
}
Different Layouts in Java
Source Code of main class
package javaapplication1;
public class JavaApplication1 {
public static void main(String[] args) {
Demo d = new Demo();
d.setSize(500,500);
d.setVisible(true);
}
}
Source Code for Flowlayout
public class Demo extends JFrame {
JPanel jp1,jp2,jp3,jp4,jp5;
JButton jb1;
public Demo()
{
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jp4 = new JPanel();
jp5 = new JPanel();
jb1=new JButton("OK");
jp2.add(jb1);
jp1.setBackground(Color.yellow);
jp2.setBackground(Color.red);
jp3.setBackground(Color.blue);
jp4.setBackground(Color.orange);
jp5.setBackground(Color.cyan);
setLayout(new FlowLayout());
add(jp1);
add(jp2);
add(jp3);
add(jp4);
add(jp5);
}
}
Source Code for Gridlayout
public class Demo extends JFrame {
JPanel jp1,jp2,jp3,jp4,jp5;
JButton jb1;
public Demo()
{
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jp4 = new JPanel();
jp5 = new JPanel();
jb1=new JButton("OK");
jp2.add(jb1);
jp1.setBackground(Color.yellow);
jp2.setBackground(Color.red);
jp3.setBackground(Color.blue);
jp4.setBackground(Color.orange);
jp5.setBackground(Color.cyan);
setLayout(new GridLayout(3,2));
add(jp1);
add(jp2);
add(jp3);
add(jp4);
add(jp5);
}
}
Source Code for Borderlayout
public class Demo extends JFrame implements ActionListener {
JPanel jp1,jp2,jp3,jp4,jp5;
JButton jb1;
public Demo()
{
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jp4 = new JPanel();
jp5 = new JPanel();
jb1=new JButton("OK");
jp2.add(jb1);
jp1.setBackground(Color.yellow);
jp2.setBackground(Color.red);
jp3.setBackground(Color.blue);
jp4.setBackground(Color.orange);
jp5.setBackground(Color.cyan);
setLayout(new BorderLayout());
add(jp1,BorderLayout.NORTH);
add(jp2,BorderLayout.SOUTH);
add(jp3,BorderLayout.EAST);
add(jp4,BorderLayout.WEST);
add(jp5,BorderLayout.CENTER);
jb1.addActionListener(this);
jb2.addActionListener(this);
}
}
LogIn Form : Using Different Layouts
Source Code of main class
package javaapplication1;
public class JavaApplication1 {
public static void main(String[] args) {
Demo t = new Demo();
t.setSize(500, 500);
t.setVisible(true);
java.net.URL imageURL = Demo.class.getResource("myic.jpg");
ImageIcon icon = new ImageIcon(imageURL);
t.setIconImage(icon.getImage());
}
}
Source Code for GUI
public class Demo extends JFrame {
JPanel jp1,jp2,jp3,jp4,jp5,jp6;
JLabel jl1,jl2,jl3,jl4;
JTextField jt1;
JPasswordField jpf1;
JButton jb1,jb2;
Demo()
{
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jp4 = new JPanel();
jp5 = new JPanel();
jp6 = new JPanel();
jl1= new JLabel("Student Data");
jp1.add(jl1);
jl2= new JLabel("Copyright - NUV");
jp6.add(jl2);
jl1.setForeground(Color.red);
jl3= new JLabel("Enter Username");
jl4= new JLabel("Enter Password");
jt1 = new JTextField(10);
jpf1 = new JPasswordField(10);
jt1.setSize(50, 50);
jb1= new JButton("LogIn");
jb2= new JButton("Exit");
jp2.setLayout(new GridLayout(3,1));
jp3.add(jl3);
jp3.add(jt1);
jp4.add(jl4);
jp4.add(jpf1);
jp5.add(jb1);
jp5.add(jb2);
jp2.add(jp3);
jp2.add(jp4);
jp2.add(jp5);
setLayout(new BorderLayout());
add(jp1,BorderLayout.NORTH);
add(jp2,BorderLayout.CENTER);
add(jp6,BorderLayout.SOUTH);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jb1)
{
String s1,s2;
s1 = jt1.getText();
s2 = jpf1.getText();
System.out.print("\nUsername is "+s1);
System.out.print("\nPassword is "+s2);
}
else if(e.getSource()==jb2)
{
System.exit(0);
}
}
}
Demo : JDialog,JFileChooser Open/Save, JWindow
Source Code of main class
package javaapplication1;
public class JavaApplication1 {
public static void main(String[] args) {
Demo t = new Demo();
t.setSize(500, 500);
t.setVisible(true);
java.net.URL imageURL = Demo.class.getResource("myic.jpg");
ImageIcon icon = new ImageIcon(imageURL);
t.setIconImage(icon.getImage());
}
}
Source Code for GUI
public class Demo extends JFrame implements ActionListener {
JPanel jp1;
JButton jb1,jb2,jb3;
Demo()
{
jp1 = new JPanel();
jb1= new JButton("Dialog Box Demo");
jb2= new JButton("File Chooser Open");
jb3= new JButton("Window Demo");
setLayout(new FlowLayout());
add(jb1);
add(jb2);
add(jb3);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jb1)
{
JDialog jd = new JDialog(this, "Demo Dialog");
JLabel l = new JLabel("Sample Label");
jd.setSize(200, 100);
jd.add(l);
jd.setVisible(true);
}
else if(e.getSource()==jb2)
{
JFileChooser fc=new JFileChooser();
int i=fc.showOpenDialog(this);
}
else if(e.getSource()==jb3)
{
JWindow jw = new JWindow();
JLabel l = new JLabel("Sample Label");
jw.add(l);
jw.setSize(200, 200);
jw.setVisible(true);
}
}
}
Demo : Set Look and Feel and changing the Icon of App
Source Code of main class
package javaapplication1;
public class JavaApplication1 {
public static void main(String[] args) {
// TODO code application logic here
UIManager.LookAndFeelInfo[] l1 = UIManager.getInstalledLookAndFeels();
for(UIManager.LookAndFeelInfo l:l1)
{
System.out.print("\n "+l.getClassName());
}
/*javax.swing.plaf.metal.MetalLookAndFeel
javax.swing.plaf.nimbus.NimbusLookAndFeel
com.sun.java.swing.plaf.motif.MotifLookAndFeel
com.sun.java.swing.plaf.windows.WindowsLookAndFeel
com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel*/
try
{
//UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
}
catch(Exception e)
{
System.out.print("Error");
}
Pra1GUI t = new Pra1GUI();
t.setTitle(":: Apple Inc ::");
t.setVisible(true);
URL img1 = Pra1GUI.class.getResource("img1.jpg");
ImageIcon ic = new ImageIcon(img1);
t.setIconImage(ic.getImage());
}
}
Source Code for GUI
public class Pra1GUI extends JFrame implements ActionListener {
JPanel jp1;
JButton jb1,jb2,jb3;
Pra1GUI()
{
jp1 = new JPanel();
jb1= new JButton("Dialog Box Demo");
jb2= new JButton("File Chooser Open");
jb3= new JButton("Window Demo");
setLayout(new FlowLayout());
add(jb1);
add(jb2);
add(jb3);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jb1)
{
JDialog jd = new JDialog(this, "Demo Dialog");
JLabel l = new JLabel("Sample Label");
jd.setSize(200, 100);
jd.add(l);
jd.setVisible(true);
}
else if(e.getSource()==jb2)
{
JFileChooser fc=new JFileChooser();
int i=fc.showOpenDialog(this);
}
else if(e.getSource()==jb3)
{
JWindow jw = new JWindow();
JLabel l = new JLabel("Sample Label");
jw.add(l);
jw.setSize(200, 200);
jw.setVisible(true);
}
}
}
Demo : More Controls and Event Handling
Source Code of main class
package javaapplication1;
public class JavaApplication1 {
public static void main(String[] args) {
// TODO code application logic here
UIManager.LookAndFeelInfo[] l1 = UIManager.getInstalledLookAndFeels();
for(UIManager.LookAndFeelInfo l:l1)
{
System.out.print("\n "+l.getClassName());
}
/*javax.swing.plaf.metal.MetalLookAndFeel
javax.swing.plaf.nimbus.NimbusLookAndFeel
com.sun.java.swing.plaf.motif.MotifLookAndFeel
com.sun.java.swing.plaf.windows.WindowsLookAndFeel
com.sun.java.swing.plaf.windows.WindowsClassicLookAndFeel*/
try
{
//UIManager.setLookAndFeel(UIManager.getCrossPlatformLookAndFeelClassName());
UIManager.setLookAndFeel("javax.swing.plaf.nimbus.NimbusLookAndFeel");
}
catch(Exception e)
{
System.out.print("Error");
}
Pra1GUI t = new Pra1GUI();
t.setTitle(":: Apple Inc ::");
t.setVisible(true);
URL img1 = Pra1GUI.class.getResource("img1.jpg");
ImageIcon ic = new ImageIcon(img1);
t.setIconImage(ic.getImage());
}
}
Source Code for GUI
public class Pra1GUI extends JFrame implements WindowListener,MouseListener,KeyListener {
JTextArea jt1;
JCheckBox jc1,jc2,jc3;
JRadioButton jr1,jr2;
static final int FPS_MIN = 0;
static final int FPS_MAX = 30;
static final int FPS_INIT = 15; //initial frames per second
Pra1GUI()
{
jt1 = new JTextArea(5,10);
jc1 = new JCheckBox("pizza");
jc2 = new JCheckBox("Pasta");
jr1 = new JRadioButton("Veg");
jr2 = new JRadioButton("Non Veg");
ButtonGroup group = new ButtonGroup();
group.add(jr1);
group.add(jr2);
JProgressBar progressBar;
progressBar = new JProgressBar(0, 100);
progressBar.setValue(40);
progressBar.setStringPainted(true);
add(progressBar);
JSlider framesPerSecond = new JSlider(JSlider.HORIZONTAL,
FPS_MIN, FPS_MAX, FPS_INIT);
//Turn on labels at major tick marks.
framesPerSecond.setMajorTickSpacing(10);
framesPerSecond.setMinorTickSpacing(1);
framesPerSecond.setPaintTicks(true);
framesPerSecond.setPaintLabels(true);
add(framesPerSecond);
add(jr1);
add(jr2);
add(jc1);
add(jc2);
add(jt1);
setLayout(new FlowLayout());
addWindowListener(this);
addMouseListener(this);
jt1.addKeyListener(this);
}
@Override
public void windowOpened(WindowEvent e)
{
}
@Override
public void windowClosed(WindowEvent e)
{
dispose();
System.exit(0);
}
@Override
public void windowClosing(WindowEvent e)
{
dispose();
System.exit(0);
}
@Override
public void windowIconified(WindowEvent e)
{
}
@Override
public void windowDeiconified(WindowEvent e)
{
}
@Override
public void windowActivated(WindowEvent e)
{
}
@Override
public void windowDeactivated(WindowEvent e)
{
}
@Override
public void mouseClicked(MouseEvent e)
{
//System.out.print("Mouse is Clicked");
}
@Override
public void mouseEntered(MouseEvent e)
{
//System.out.print("Mouse is Entered");
}
@Override
public void mouseExited(MouseEvent e)
{
//System.out.print("Mouse is Exited");
}
@Override
public void mousePressed(MouseEvent e)
{
//System.out.print("Mouse is Pressed");
}
@Override
public void mouseReleased(MouseEvent e)
{
//System.out.print("Mouse is Released");
}
@Override
public void keyTyped(KeyEvent e)
{
if(e.getSource() == jt1)
{
char c= e.getKeyChar();
int a = c;
if(a>=48 && a<57)
{
}
else
{
JOptionPane.showMessageDialog(this,"Numeric Values are allowed","::NUV::",JOptionPane.ERROR_MESSAGE);
jt1.setText("");
}
}
}
@Override
public void keyPressed(KeyEvent e)
{
}
@Override
public void keyReleased(KeyEvent e)
{
}
}
Demo : File Viewer
Source Code of main class
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.net.*;
public class FileManager
{
public static void main(String[] args)
{
Demo t = new Demo();
t.setTitle(":: W3TechBlog Community ::");
t.setVisible(true);
try
{
URL img1 = new URL("https://www.w3techblog.com/icon/favicon.png");
ImageIcon ic = new ImageIcon(img1);
t.setIconImage(ic.getImage());
t.setSize(600,600);
}
catch(Exception e)
{
}
}
}
Source Code for GUI
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
public class Demo extends JFrame implements ActionListener {
JPanel jp1,jp2,jp3;
JTextArea jt1;
JButton jb1,jb2,jb3;
File file;
JLabel jl1;
Demo()
{
jp1 = new JPanel();
jp2 = new JPanel();
jp3 = new JPanel();
jt1= new JTextArea(30,50);
JScrollPane scrollableTextArea = new JScrollPane(jt1);
jl1= new JLabel(":: Developed By : w3techblog.com ::");
scrollableTextArea.setHorizontalScrollBarPolicy(JScrollPane.HORIZONTAL_SCROLLBAR_ALWAYS);
scrollableTextArea.setVerticalScrollBarPolicy(JScrollPane.VERTICAL_SCROLLBAR_ALWAYS);
jb1= new JButton("Open");
jb2= new JButton("Save");
jb3= new JButton("Exit");
setLayout(new BorderLayout());
jp1.add(jb1);
jp1.add(jb2);
jp1.add(jb3);
jp3.add(jl1);
jp2.add(scrollableTextArea);
add(jp1,BorderLayout.NORTH);
add(jp2,BorderLayout.CENTER);
add(jp3,BorderLayout.SOUTH);
jb1.addActionListener(this);
jb2.addActionListener(this);
jb3.addActionListener(this);
}
public void actionPerformed(ActionEvent e)
{
if(e.getSource()==jb1)
{
JFileChooser fc=new JFileChooser();
int i=fc.showOpenDialog(this);
if (i == JFileChooser.APPROVE_OPTION)
{
try
{
file = fc.getSelectedFile();
System.out.print(file.toString());
StringBuffer sb = new StringBuffer();
FileInputStream fis = new FileInputStream(file);
while(5==5)
{
int n = fis.read();
if(n==-1)
{
break;
}
else
{
//System.out.print((char)n);
sb.append((char)n);
jt1.setText(sb.toString());
}
}
}
catch(Exception e1)
{
System.out.print(e1.getMessage());
}
}
else
{
}
}
else if(e.getSource()==jb2)
{
try
{
FileOutputStream fos = new FileOutputStream(file);
byte[] b = new byte[10000];
b = jt1.getText().getBytes();
fos.write(b);
}
catch(Exception e1)
{
System.out.print(e1.getMessage());
}
}
else if(e.getSource()==jb3)
{
this.dispose();
System.exit(0);
}
}
}