String Swap with GUI

Structure of the Problem Requirements 

In this problem we will learn some GUI components and String swap in Java Program using Netbeans IDE. Swap replace the position of your elements (string or data) according to your logic in program. In this program we have two strings and we swap last string with first string. After input the user just press the swap button and both string will be changed their position. Here is the source code of this problem which help you in better understanding.

Source Code 

public class NewJFrame extends javax.swing.JFrame {

    /**

     * Creates new form NewJFrame

     */

    public NewJFrame() {

        initComponents();

    }

    /**

     * This method is called from within the constructor to initialize the form.

     * WARNING: Do NOT modify this code. The content of this method is always

     * regenerated by the Form Editor.

     */

    @SuppressWarnings("unchecked")

    // <editor-fold defaultstate="collapsed" desc="Generated Code">                         

    private void initComponents() {

        jPanel1 = new javax.swing.JPanel();

        jLabel1 = new javax.swing.JLabel();

        jLabel2 = new javax.swing.JLabel();

        jTextField1 = new javax.swing.JTextField();

        jLabel3 = new javax.swing.JLabel();

        jTextField2 = new javax.swing.JTextField();

        jButton1 = new javax.swing.JButton();

        jLabel4 = new javax.swing.JLabel();

        jLabel5 = new javax.swing.JLabel();

        jTextField3 = new javax.swing.JTextField();

        jTextField4 = 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, 36)); // NOI18N

        jLabel1.setText("String's Swap");

        jPanel1.add(jLabel1, new org.netbeans.lib.awtextra.AbsoluteConstraints(70, 0, 230, 40));

        jLabel2.setText("Enter First String");

        jPanel1.add(jLabel2, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 70, 90, 20));

        jPanel1.add(jTextField1, new org.netbeans.lib.awtextra.AbsoluteConstraints(130, 70, 250, -1));

        jLabel3.setText("Enter Second String");

        jPanel1.add(jLabel3, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 100, 100, -1));

        jPanel1.add(jTextField2, new org.netbeans.lib.awtextra.AbsoluteConstraints(130, 100, 250, -1));

        jButton1.setText("Swap");

        jButton1.addActionListener(newjava.awt.event.ActionListener() {

            public voidactionPerformed(java.awt.event.ActionEvent evt) {

                jButton1ActionPerformed(evt);

            }

        });

        jPanel1.add(jButton1, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 150, 110, 30));

        jLabel4.setText("First String");

        jPanel1.add(jLabel4, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 200, 100, 30));

        jLabel5.setText("Second String");

        jPanel1.add(jLabel5, new org.netbeans.lib.awtextra.AbsoluteConstraints(10, 250, 70, 30));

        jPanel1.add(jTextField3, new org.netbeans.lib.awtextra.AbsoluteConstraints(100, 200, 260, 30));

        jPanel1.add(jTextField4, new org.netbeans.lib.awtextra.AbsoluteConstraints(100, 250, 260, 30));

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());

        getContentPane().setLayout(layout);

        layout.setHorizontalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()

                .addGap(0, 160, Short.MAX_VALUE)

                .addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))

        );

        layout.setVerticalGroup(

            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)

            .addComponent(jPanel1, javax.swing.GroupLayout.Alignment.TRAILING, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)

        );

        pack();

    }// </editor-fold>                       

    private voidjButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                        

        // TODO add your handling code here:

        jButton1.addActionListener(null);

        String a=jTextField1.getText();

        String b=jTextField2.getText();

        String temp=null;

        temp=a;

        a=b;

        b=temp;

        jTextField3.setText(a);

        jTextField4.setText(b);

       

    }                                       

    /**

     * @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(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        } catch(InstantiationException ex) {

            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        } catch (IllegalAccessException ex) {

            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        } catch (javax.swing.UnsupportedLookAndFeelException ex) {

            java.util.logging.Logger.getLogger(NewJFrame.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);

        }

        //</editor-fold>

        /* Create and display the form */

        java.awt.EventQueue.invokeLater(newRunnable() {

            public void run() {

                new NewJFrame().setVisible(true);

            }

        });

    }

    // Variables declaration - do not modify                    

    private javax.swing.JButton jButton1;

    private javax.swing.JLabel jLabel1;

    private javax.swing.JLabel jLabel2;

    private javax.swing.JLabel jLabel3;

    private javax.swing.JLabel jLabel4;

    private javax.swing.JLabel jLabel5;

    private javax.swing.JPanel jPanel1;

    private javax.swing.JTextField jTextField1;

    private javax.swing.JTextField jTextField2;

    private javax.swing.JTextField jTextField3;

    private javax.swing.JTextField jTextField4;

    // End of variables declaration                  

}

Output of the Program

String Swap with GUI Components

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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.