Java - Images Navigation From A Folder

Java Code -  Navigate And Display Images From Resource Folder Using NetBeans .

                                                                           


In this java Tutorial we will see How To Create A Buttons Navigation To Display Images In A JLable Using NetBeans .






Methods :
    - Method "getImages" To Get A List Of Image Name From Resource Folder
       
    public String[] getImages()
    {

     File file = new File(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/Images").getFile());

     String[] imagesList = file.list();

      return imagesList;

    }

 - Method "showImage" This Method Take One Parameter Which Is The Index Of The Image In Images List Returned By The "getImages" Method And Take The Image And Display It With The Same Width And Height As The JLabel .

public void showImage(int index)
    {
        String[] imagesList = getImages();

        String imageName = imagesList[index];

        ImageIcon icon = new ImageIcon(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/Images/"+imageName));

        Image image = icon.getImage().getScaledInstance(jLabel_Image.getWidth(), jLabel_Image.getHeight(), Image.SCALE_SMOOTH);

        jLabel_Image.setIcon(new ImageIcon(image));
    }


Entire Project Source Code:
    
package JAVA_VIDEOS_TUTORIALS;

import java.awt.Image;
import java.io.File;
import javax.swing.ImageIcon;

/**
 *
 * @author 1bestcsharp.blogspot.com
 */
public class Images_From_Folder_Navigation extends javax.swing.JFrame {

    /**
     * Creates new form Images_From_Folder_Navigation
     */
    public Images_From_Folder_Navigation() {
        initComponents();
       // display first image
        showImage(pos);
    }
    
// the index of the images
    int pos = 0;
    
// get images list
    public String[] getImages()
    {
        File file = new File(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/Images").getFile());
        String[] imagesList = file.list();
        return imagesList;
    }

// display the image by index
    public void showImage(int index)
    {
        String[] imagesList = getImages();
        String imageName = imagesList[index];
        ImageIcon icon = new ImageIcon(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/Images/"+imageName));
        Image image = icon.getImage().getScaledInstance(jLabel_Image.getWidth(), jLabel_Image.getHeight(), Image.SCALE_SMOOTH);
        jLabel_Image.setIcon(new ImageIcon(image));
    }
    
    
    /**
     * 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() {

        jLabel_Image = new javax.swing.JLabel();
        jButton1 = new javax.swing.JButton();
        jButton_Next = new javax.swing.JButton();
        jButton_Previous = new javax.swing.JButton();
        jButton_Last = new javax.swing.JButton();

        setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

        jButton1.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        jButton1.setIcon(new javax.swing.ImageIcon(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/icons/first.png"))); // NOI18N
        jButton1.setText("First");
        jButton1.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jButton1.setHorizontalTextPosition(javax.swing.SwingConstants.RIGHT);
        jButton1.setIconTextGap(0);
        jButton1.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton1ActionPerformed(evt);
            }
        });

        jButton_Next.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        jButton_Next.setIcon(new javax.swing.ImageIcon(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/icons/next.png"))); // NOI18N
        jButton_Next.setText("Next");
        jButton_Next.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jButton_Next.setHorizontalTextPosition(javax.swing.SwingConstants.RIGHT);
        jButton_Next.setIconTextGap(0);
        jButton_Next.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton_NextActionPerformed(evt);
            }
        });

        jButton_Previous.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        jButton_Previous.setIcon(new javax.swing.ImageIcon(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/icons/previous.png"))); // NOI18N
        jButton_Previous.setText("Previous");
        jButton_Previous.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jButton_Previous.setHorizontalTextPosition(javax.swing.SwingConstants.RIGHT);
        jButton_Previous.setIconTextGap(0);
        jButton_Previous.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton_PreviousActionPerformed(evt);
            }
        });

        jButton_Last.setFont(new java.awt.Font("Tahoma", 0, 14)); // NOI18N
        jButton_Last.setIcon(new javax.swing.ImageIcon(getClass().getResource("/JAVA_VIDEOS_TUTORIALS/icons/last.png"))); // NOI18N
        jButton_Last.setText("Last");
        jButton_Last.setHorizontalAlignment(javax.swing.SwingConstants.LEFT);
        jButton_Last.setHorizontalTextPosition(javax.swing.SwingConstants.RIGHT);
        jButton_Last.setIconTextGap(0);
        jButton_Last.addActionListener(new java.awt.event.ActionListener() {
            public void actionPerformed(java.awt.event.ActionEvent evt) {
                jButton_LastActionPerformed(evt);
            }
        });

        javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
        getContentPane().setLayout(layout);
        layout.setHorizontalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addComponent(jLabel_Image, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
            .addGroup(layout.createSequentialGroup()
                .addGap(39, 39, 39)
                .addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(48, 48, 48)
                .addComponent(jButton_Next, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(44, 44, 44)
                .addComponent(jButton_Previous)
                .addGap(49, 49, 49)
                .addComponent(jButton_Last, javax.swing.GroupLayout.PREFERRED_SIZE, 115, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addContainerGap(71, Short.MAX_VALUE))
        );
        layout.setVerticalGroup(
            layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
            .addGroup(layout.createSequentialGroup()
                .addComponent(jLabel_Image, javax.swing.GroupLayout.PREFERRED_SIZE, 336, javax.swing.GroupLayout.PREFERRED_SIZE)
                .addGap(18, 18, 18)
                .addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
                    .addComponent(jButton1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                    .addComponent(jButton_Next, javax.swing.GroupLayout.DEFAULT_SIZE, 46, Short.MAX_VALUE)
                    .addComponent(jButton_Previous, javax.swing.GroupLayout.DEFAULT_SIZE, 46, Short.MAX_VALUE)
                    .addComponent(jButton_Last, javax.swing.GroupLayout.DEFAULT_SIZE, 46, Short.MAX_VALUE))
                .addGap(27, 27, 27))
        );

        pack();
    }// </editor-fold>                        

     // The First , Next , Previous ,Last Navigation Buttons

    // First
    private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {                                         
        
        pos = 0;
        showImage(pos);
        
    }                                        

     // Next
    private void jButton_NextActionPerformed(java.awt.event.ActionEvent evt) {                                             
       pos = pos + 1;
       if(pos >= getImages().length)
       {
           pos  = getImages().length - 1;
       }
       showImage(pos);
    }                                            

     // Previous
    private void jButton_PreviousActionPerformed(java.awt.event.ActionEvent evt) {                                                 
       pos = pos - 1;
       if(pos < 0)
       {
           pos = 0;
       }
       showImage(pos);
    }                                                

     // Last
    private void jButton_LastActionPerformed(java.awt.event.ActionEvent evt) {                                             
       pos = getImages().length - 1;
       showImage(pos);
    }                                            

    /**
     * @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(Images_From_Folder_Navigation.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (InstantiationException ex) {
            java.util.logging.Logger.getLogger(Images_From_Folder_Navigation.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (IllegalAccessException ex) {
            java.util.logging.Logger.getLogger(Images_From_Folder_Navigation.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
        } catch (javax.swing.UnsupportedLookAndFeelException ex) {
            java.util.logging.Logger.getLogger(Images_From_Folder_Navigation.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 Images_From_Folder_Navigation().setVisible(true);
            }
        });
    }

    // Variables declaration - do not modify                     
    private javax.swing.JButton jButton1;
    private javax.swing.JButton jButton_Last;
    private javax.swing.JButton jButton_Next;
    private javax.swing.JButton jButton_Previous;
    private javax.swing.JLabel jLabel_Image;
    // End of variables declaration                   
}

     
///////////////OUTPUT:
netbeans images navigation
Java Images First Next Previous Last



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3 comments

comments
11 février 2016 à 08:54 delete

I have never understand about it, just now is clear, thanks for give sharing this to all together.
Regards - Blot Tutorial Supporter

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21 mai 2016 à 16:57 delete

thank you for this video , but when i convert it to jar application it wont open .

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28 septembre 2016 à 21:52 delete

Can you help me?

I have a problem in following your video. when I run the program in case of error Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException.

error message refers to "showImage (post);" that affect the value of "int index"

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