Listening for Changes to the Selected File in a JFileChooser Dialog

    
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import java.io.File;
import java.util.Arrays;

import javax.swing.JFileChooser;

public class Main {
  public static void main(String[] argv) {

    JFileChooser chooser = new JFileChooser();

    chooser.addPropertyChangeListener(new PropertyChangeListener() {
      public void propertyChange(PropertyChangeEvent evt) {
        if (JFileChooser.SELECTED_FILE_CHANGED_PROPERTY.equals(evt.getPropertyName())) {
          JFileChooser chooser = (JFileChooser) evt.getSource();
          File oldFile = (File) evt.getOldValue();
          File newFile = (File) evt.getNewValue();

          System.out.println(oldFile);
          System.out.println(newFile);
          System.out.println(chooser.getSelectedFile());
        } else if (JFileChooser.SELECTED_FILES_CHANGED_PROPERTY.equals(evt.getPropertyName())) {
          JFileChooser chooser = (JFileChooser) evt.getSource();
          File[] oldFiles = (File[]) evt.getOldValue();
          File[] newFiles = (File[]) evt.getNewValue();

          Arrays.toString(oldFiles);
          Arrays.toString(newFiles);
          File[] files = chooser.getSelectedFiles();
          Arrays.toString(files);
        }
      }
    });

    chooser.setVisible(true);
    
  }
}

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Listening for Changes to the Selected File in a JFileChooser Dialog : File Chooser « Swing JFC « Java

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