The document describes a Java program that implements a login form using Swing components. The program displays labels, text fields, and buttons to accept a username and password. It verifies the login credentials and displays different messages depending on whether the login succeeded or failed. If the cancel button is clicked, a confirmation dialog is shown to ask if the user really wants to exit.

1. Listing Program :
package pbo2;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
class java extends JFrame implements ActionListener{
JLabel nama;
JTextField tnama;
JLabel kunci;
JTextField tkunci;
JButton ok;
JButton cancel;
public java (){
super ("Login Mantaff gan");
nama = new JLabel("User Name : ");
tnama = new JTextField(10);
kunci = new JLabel("Pasword : ");
tkunci = new JTextField(4);
ok = new JButton("OK");
cancel = new JButton("Cancel");
Container k = this.getContentPane();
GridBagLayout gb = new GridBagLayout();
k.setLayout(gb);
GridBagConstraints g = new GridBagConstraints();
g.insets = new Insets(5, 5, 5, 5);
g.fill = GridBagConstraints.BOTH;
g.gridx = 0;
g.gridy = 0;
g.gridwidth = 1;
g.gridheight = 1;
gb.setConstraints(nama, g);
k.add(nama);
g.gridx = 1;
g.gridy = 0;
g.gridwidth = 3;
g.gridheight = 1;
gb.setConstraints(tnama, g);
k.add(tnama);
g.gridx = 0;
g.gridy = 1;
g.gridwidth = 1;
g.gridheight = 1;
gb.setConstraints(kunci, g);
k.add(kunci);
g.gridx = 1;
g.gridy = 1;
g.gridwidth = 3;
g.gridheight = 1;
gb.setConstraints(tkunci, g);

2. k.add(tkunci);
g.gridx = 0;
g.gridy = 2;
g.gridwidth = 2;
g.gridheight = 1;
gb.setConstraints(ok, g);
k.add(ok);
g.gridx = 2;
g.gridy = 2;
g.gridwidth = 2;
g.gridheight = 1;
gb.setConstraints(cancel, g);
k.add(cancel);
setResizable(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
pack();
setVisible(true);
ok.addActionListener(this);
cancel.addActionListener(this);
}
public void actionPerformed(ActionEvent e) {
if(e.getSource() == ok) {
if(tnama.getText().equals("123090069")&&tkunci.getText().equals("java2"))
JOptionPane.showMessageDialog(this, "Thanks For Login Gan,n" +
"", "message",
JOptionPane.INFORMATION_MESSAGE);
else
JOptionPane.showMessageDialog(this, "Login lo Kagak Bener Gan,n" +
"Coba lagi gan", "message",
JOptionPane.INFORMATION_MESSAGE);
tnama.setText("");
tkunci.setText("");
dispose();
}
if(e.getSource()== cancel){
exit();
}
}
public void exit() {
switch (JOptionPane.showConfirmDialog(this, "Beneran Exit ni Gan?","Cancel
Option",JOptionPane.YES_NO_OPTION)) {
case JOptionPane.YES_OPTION:
System.out.println("Yes");
System.exit(0);
break;
case JOptionPane.NO_OPTION:
System.out.println("No");
break;
}
}

3. }
public class java3{
public static void main(String[] args) {
java j = new java();
}
}
Output :
Form Login : Isi Text Field yang benar :
Output Jika Login berhasil : Login yang salah :
Jika Login Gagal : Output Ketika mengklik cancel :