Structure of the Problem Requirements
In this problem we will learn how to make a Combo box in java using Netbeans IDE. Combo box is used to select a file or item from a drop menu. In this program we make a combo box and and put two menu in it. On clicking the drop menu of combo box the specific atom will be show in text area. Here is the source code of this problem which help you in better understanding.
Source Code
public class NewJFrame1 extends javax.swing.JFrame {
/**
* Creates new form NewJFrame1
*/
public NewJFrame1() {
initComponents();
}
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
jLabel1 = new javax.swing.JLabel();
jComboBox1 = new javax.swing.JComboBox();
jPanel2 = new javax.swing.JPanel();
jTextField1 = new javax.swing.JTextField();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
jLabel1.setFont(new java.awt.Font("Tahoma", 0, 48)); // NOI18N
jLabel1.setForeground(new java.awt.Color(255, 51, 51));
jLabel1.setText("LEP");
jPanel1.add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(140, 0, 162, 50));
jComboBox1.setBackground(new java.awt.Color(102, 255, 102));
jComboBox1.setFont(new java.awt.Font("Times New Roman", 1, 24)); // NOI18N
jComboBox1.setModel(new javax.swing.DefaultComboBoxModel(new String[] { "Programming", "SEO", "Android", "Liinux" }));
jComboBox1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jComboBox1ActionPerformed(evt);
}
});
jPanel1.add(jComboBox1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 70, 400, 50));
jPanel2.setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
jPanel2.add(jTextField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 1, 400, 180));
jPanel1.add(jPanel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 120, 400, 180));
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
);
pack();
}// </editor-fold>
private void jComboBox1ActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(jComboBox1.getSelectedIndex()==0)
{
jTextField1.setText("Selected Programming...!!!");
}
else if(jComboBox1.getSelectedIndex()==1)
{
jTextField1.setText("Selected SEO...!!!");
}
else if(jComboBox1.getSelectedIndex()==2)
{
jTextField1.setText("Selected Android...!!!");
}
else if(jComboBox1.getSelectedIndex()==3)
{
jTextField1.setText("Selected Linux...!!!");
}
else
{
jComboBox1.setSelectedIndex(0);
}
}
/**
* @param args the command line arguments
*/
public static void main(String args[]) {
/* Set the Nimbus look and feel */
//<editor-fold defaultstate="collapsed" desc=" Look and feel setting code (optional) ">
/* If Nimbus (introduced in Java SE 6) is not available, stay with the default look and feel.
* For details see http://download.oracle.com/javase/tutorial/uiswing/lookandfeel/plaf.html
*/
try {
for (javax.swing.UIManager.LookAndFeelInfo info : javax.swing.UIManager.getInstalledLookAndFeels()) {
if ("Nimbus".equals(info.getName())) {
javax.swing.UIManager.setLookAndFeel(info.getClassName());
break;
}
}
} catch (ClassNotFoundException ex) {
java.util.logging.Logger.getLogger(NewJFrame1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(NewJFrame1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(NewJFrame1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(NewJFrame1.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
}
//</editor-fold>
/* Create and display the form */
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new NewJFrame1().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JComboBox jComboBox1;
private javax.swing.JLabel jLabel1;
private javax.swing.JPanel jPanel1;
private javax.swing.JPanel jPanel2;
private javax.swing.JTextField jTextField1;
// End of variables declaration
}
Output Of Program
 |
| Combo box with Drop menu in Java |
 |
| Combo box with Drop menu in Java |
Asad Niazi is Software Engineer , Programmer, Web Developers and a young mentor of Tech Solutions Desk and Blogging Solutions . Asad Love to writes about Technology, Programming, Blogging and make money online.
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