Всем привет, не могли бы вы мне помочь? У меня возникли проблемы с созданием слайдера изображений в моем проекте колледжа. Ошибка :исключение в потоке "AWT-eventqueue-0" java.lang.nullpointerexception.
Hello Everyone.Can you help me?I am getting problem in creating Image Slider in my college project. Error :Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException.
run: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at Gallery.show(Gallery.java:39) at Gallery.<init>(Gallery.java:27) at Gallery$3.run(Gallery.java:139) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:756) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76) at java.awt.EventQueue.dispatchEvent(EventQueue.java:726) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)
Что я уже пробовал:
import java.awt.Image;
import java.io.File;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.ImageIcon;
/*
* To change this license header, choose License Headers in Project Properties.
* To change this template file, choose Tools | Templates
* and open the template in the editor.
*/
/**
*
* @author Admin
*/
public class Gallery extends javax.swing.JFrame {
/**
* Creates new form Gallery
*/
public Gallery() {
initComponents();
show(position);
}
int position=0;
public String[] takeimage()
{
File f = new File(getClass().getResource("/imagepath").getFile());
String[] Images=f.list();
return Images;
}
public void show(int index)
{
String[] Images=takeimage();
String img=Images[index];
ImageIcon icon=new ImageIcon(getClass().getResource("/imagepath/"+img));
Image image=icon.getImage().getScaledInstance(innerL.getWidth(), innerL.getHeight(),Image.SCALE_SMOOTH);
innerL.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() {
innerL = new javax.swing.JLabel();
preiv = new javax.swing.JButton();
next = new javax.swing.JButton();
outerL = new javax.swing.JLabel();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(new org.netbeans.lib.awtextra.AbsoluteLayout());
getContentPane().add(innerL, new org.netbeans.lib.awtextra.AbsoluteConstraints(230, 50, 320, 210));
preiv.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
preivMousePressed(evt);
}
});
getContentPane().add(preiv, new org.netbeans.lib.awtextra.AbsoluteConstraints(30, 110, 40, 40));
next.addMouseListener(new java.awt.event.MouseAdapter() {
public void mousePressed(java.awt.event.MouseEvent evt) {
nextMousePressed(evt);
}
});
getContentPane().add(next, new org.netbeans.lib.awtextra.AbsoluteConstraints(640, 110, 50, 40));
outerL.setIcon(new javax.swing.ImageIcon("C:\\Users\\Admin\\Desktop\\images\\gallery.jpg")); // NOI18N
getContentPane().add(outerL, new org.netbeans.lib.awtextra.AbsoluteConstraints(0, 0, 770, 300));
pack();
}// </editor-fold>
private void nextMousePressed(java.awt.event.MouseEvent evt) {
new Thread();
try {
Thread.sleep(300);
} catch (InterruptedException ex) {
Logger.getLogger(Gallery.class.getName()).log(Level.SEVERE, null, ex);
}
int p=this.innerL.getX();
if(p>=1)
{
Animacion.Animacion.mover_izquierda(900, 200, 1, 2, innerL);
}
position=position+1;
if(position>=takeimage().length)
{
position=takeimage().length-1;
}
}
private void preivMousePressed(java.awt.event.MouseEvent evt) {
// TODO add your handling code here:
}
/**
* @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(Gallery.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (InstantiationException ex) {
java.util.logging.Logger.getLogger(Gallery.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (IllegalAccessException ex) {
java.util.logging.Logger.getLogger(Gallery.class.getName()).log(java.util.logging.Level.SEVERE, null, ex);
} catch (javax.swing.UnsupportedLookAndFeelException ex) {
java.util.logging.Logger.getLogger(Gallery.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 Gallery().setVisible(true);
}
});
}
// Variables declaration - do not modify
private javax.swing.JLabel innerL;
private javax.swing.JButton next;
private javax.swing.JLabel outerL;
private javax.swing.JButton preiv;
// End of variables declaration
}