Program Java ComboBox

//Program ComboBox

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

class DemoComboBox implements ActionListener {

public JLabel labelNama,labelLahir,labelTanggal,labelBulan, labelTahun;

public JTextField tfNama,tfInfo;

public JComboBox comboTanggal, comboBulan, comboTahun;

public JButton btnProses;

public DemoComboBox() {

String s1 = "Nama:";

labelNama = new JLabel(s1);

labelNama.setLocation(10,10);

labelNama.setSize(labelNama.getPreferredSize());

tfNama = new JTextField(25);

tfNama.setLocation(10,30);

tfNama.setSize(tfNama.getPreferredSize());

String s2 = "Tanggal Lahir:";

labelLahir = new JLabel(s2);

labelLahir.setLocation(10,55);

labelLahir.setSize(labelLahir.getPreferredSize());

labelTanggal = new JLabel("Hari ke:");

labelTanggal.setLocation(35,75);

labelTanggal.setSize(labelTanggal.getPreferredSize());

comboTanggal = new JComboBox();

comboTanggal.setLocation(35,95);

comboTanggal.setSize(labelTanggal.getPreferredSize());

for (int i=0;i<31;i++)>

comboTanggal.addItem(new String().valueOf(i+1));

}

labelBulan = new JLabel("Bulan");

labelBulan.setLocation(95,75);

labelBulan.setSize(labelBulan.getPreferredSize());

comboBulan = new JComboBox();

comboBulan.setLocation(95,93);

comboBulan.setSize(labelLahir.getPreferredSize());

String[]bulan={"Januari","Februari","Maret","April","Mei","Juni","Juli","Agustus","September","Oktober","November","Desember"};

for (int i=0;i

comboBulan.addItem(bulan[i]);

}

labelTahun = new JLabel("Tahun");

labelTahun.setLocation(190,75);

labelTahun.setSize(labelTahun.getPreferredSize());

comboTahun = new JComboBox();

comboTahun.setLocation(190,93);

comboTahun.setSize(labelLahir.getPreferredSize());

for (int i=1960;i<2007;i++)>

comboTahun.addItem(new String().valueOf(i));

}

btnProses = new JButton("Porses Data");

btnProses.setLocation(305,25);

btnProses.setSize(btnProses.getPreferredSize());

btnProses.addActionListener(this);

btnProses.setMnemonic('P');

tfInfo = new JTextField(50);

tfInfo.setLocation(100,250);

tfInfo.setSize(250,25);

tfInfo.setEditable(false);

}

public void createAndShowGUI(){

JFrame.setDefaultLookAndFeelDecorated(true);

JFrame frame = new JFrame("Contoh JComboBox");

frame.setLayout(null);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.getContentPane().add(labelNama);

frame.getContentPane().add(tfNama);

frame.getContentPane().add(labelLahir);

frame.getContentPane().add(labelTanggal);

frame.getContentPane().add(comboTanggal);

frame.getContentPane().add(labelBulan);

frame.getContentPane().add(comboBulan);

frame.getContentPane().add(labelTahun);

frame.getContentPane().add(comboTahun);

frame.getContentPane().add(btnProses);

frame.getContentPane().add(tfInfo);

frame.setBounds(0,0,450,350);

frame.setLocationRelativeTo(null);

frame.setVisible(true);

}

public void actionPerformed(ActionEvent event) {

if (event.getSource() == btnProses) {

String s = tfNama.getText() +",Lahir pada " +

comboTanggal.getSelectedItem()+""+

comboBulan.getSelectedItem()+""+comboTahun.getSelectedItem();

tfInfo.setText(s);

}

}

public static void main(String[]args){

javax.swing.SwingUtilities.invokeLater(new Runnable() {

public void run(){

DemoComboBox app = new DemoComboBox();

app.createAndShowGUI();

}

});

}

}

Output;