Penggunaan Event Handling Pada
Komponen-Kompenen Java Swing
Tugas!
1.
Membuat sebuah tampilan form menggunakan checkbox, dengan
memodifikasi EventRadio.java lalu menggantikan JRadioButton jadi menggunakan JcheckBox.
Berikut kode program dan hasilnya.
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class CheckBoxHandling extends JFrame
implements ItemListener {
private
JTextField teks;
private
JPanel panel;
private
JCheckBox cbTn1, cbTn2, cbTn3;
public
CheckBoxHandling() {
setTitle("Coba
CheckBox Button Handling");
teks
= new JTextField("Jenis Kelamin : Pilihan");
teks.setHorizontalAlignment(SwingConstants.CENTER);
panel
= new JPanel(new FlowLayout());
cbTn1
= new JCheckBox("Pria");
cbTn2
= new JCheckBox("Wanita");
cbTn3
= new JCheckBox("Banci");
ButtonGroup
group = new ButtonGroup();
group.add(cbTn1);
group.add(cbTn2);
group.add(cbTn3);
cbTn1.addItemListener(this);
cbTn2.addItemListener(this);
cbTn3.addItemListener(this);
setLayout(new
BorderLayout());
add(teks,
"North");
add(panel,
"West");
panel.add(cbTn1);
panel.add(cbTn2);
panel.add(cbTn3);
pack();
setVisible(true);
setLocation(200,200);
setDefaultCloseOperation(EXIT_ON_CLOSE);
}
public
void itemStateChanged(ItemEvent event) {
if(event.getSource()==cbTn1)
{
if(event.getStateChange()==ItemEvent.SELECTED)
teks.setText("Jenis
Kelamin : Pria");
}
if(event.getSource()==cbTn2)
{
if(event.getStateChange()==ItemEvent.SELECTED)
teks.setText("Jenis
Kelamin : Wanita");
}
if(event.getSource()==cbTn3)
{
if(event.getStateChange()==ItemEvent.SELECTED)
teks.setText("Jenis
Kelamin :Banci");
}
}
}
public
class EventcheckBox {
public
static void main (String[] args) {
new
CheckBoxHandling();
}
}
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2.
Membuat tampilan Form Login dengan menambahkan Event
Handling agar program dapat melaksanakan sebuah perintah atau proses dan aksi. Sehingga
ketika button login/ok atau cancel dapat melakukan prosesnya. Berikut kode
program dan hasilnya.
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import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class login extends JFrame implements
ActionListener{
public JLabel usnama, password;
public JTextField tusnama;
public JPasswordField ppas;
public JButton login, exit;
public login(){
usnama = new JLabel("User Name
:");
usnama.setLocation(20, 30);
usnama.setSize(usnama.getPreferredSize());
tusnama = new JTextField(20);
tusnama.setLocation(150, 30);
tusnama.setSize(tusnama.getPreferredSize());
password = new JLabel("Password
:");
password.setLocation(20, 60);
password.setSize(password.getPreferredSize());
ppas = new JPasswordField(20);
ppas.setEchoChar('?');
ppas.setLocation(150, 60);
ppas.setSize(ppas.getPreferredSize());
login = new JButton("Ok");
login.setLocation(250, 90);
login.addActionListener(this);
login.setSize(login.getPreferredSize());
exit = new
JButton("Cancel");
exit.setLocation(320, 90);
exit.addActionListener(this);
exit.setSize(exit.getPreferredSize());
}
public void show(){
JFrame.setDefaultLookAndFeelDecorated(true);
JFrame f = new
JFrame("Login");
f.setLayout(null);
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
f.getContentPane().add(usnama);
f.getContentPane().add(tusnama);
f.getContentPane().add(password);
f.getContentPane().add(ppas);
f.getContentPane().add(login);
f.getContentPane().add(exit);
f.setBounds(0, 0, 410, 200);
f.setLocationRelativeTo(null);
f.setVisible(true);
}
public static void main(String[]args){
javax.swing.SwingUtilities.invokeLater(new
Runnable() {
public void run() {
login tampil = new login();
tampil.show();
}
});
}
private String user="",
passs="";
public void actionPerformed(ActionEvent
e) {
if (e.getSource()==exit){
System.exit(ABORT);
}
if (e.getSource()==login) {
user = tusnama .getText();
passs = ppas .getText();
if
(user.equals("Login")&&
passs.equals("enterduakali")){
//Login masuk = new Login();
//masuk.show();
}
else {
JOptionPane.showMessageDialog(null,
"Username and password Tidak Valid");
usnama .setText("");
ppas .setText("");
usnama.requestFocus(true);
}
}
}
}
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