Combo Box in Java

This is simple java exercise in which beginners will learn how to make Combo box in java using Netbeans IDE. Combo box is used to select a file or item from a drop menu.

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

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About Asad

Asad Niazi is Software Engineer , Programmer, Web Developer and a young mentor of BloggersTown and PProgramming. Asad Love to writes about Technology, Programming, Blogging and make money online.