检查JList中是否存在文件

Question

I have added a few files in my JList from the JFileChooser. I am adding a new button named "CHECK" which when clicked, tells if a particular file exists in the JList(among the files already added). It would be really great if any of you could tell me what is the correct procedure to do this step.

Thanking You in Advance..

This is my code currently;

            final JFileChooser fileChooser = new JFileChooser();
    fileChooser.setFileSelectionMode(JFileChooser.FILES_AND_DIRECTORIES);
    fileChooser.setMultiSelectionEnabled(true);
    getContentPane().add(fileChooser, "cell 0 0 3 9");

    JScrollPane scrollPane = new JScrollPane();
    getContentPane().add(scrollPane, "cell 10 1 3 8,grow");

    vector = new Vector<File>();
    final JList list = new JList(vector);
    scrollPane.setViewportView(list);

    JPanel panel = new JPanel();
    getContentPane().add(panel, "cell 3 4 7 1,grow");

    JButton btnNewButton = new JButton("Add Files");
    btnNewButton.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            for (File file : fileChooser.getSelectedFiles()) {
                        vector.add(file);
                        System.out.println("Added..!!");
                }
                list.updateUI();

            }
    });
    panel.add(btnNewButton);

    JButton btnNewButton_1 = new JButton("Remove Files");
    btnNewButton_1.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            if(list.getSelectedIndices().length > 0) {
                  int[] selectedIndices = list.getSelectedIndices();
                  for (int i = selectedIndices.length-1; i >=0; i--) {
                        vector.removeElementAt(i);
                        System.out.println("Removed..!!");
                  } 
                   }
                    list.updateUI();

        }   
        });
    panel.add(btnNewButton_1);

    JButton btnNewButton_2 = new JButton("Check For Files");
    btnNewButton_2.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent e) {
            String name = "";
            if(list.getSelectedIndices().length > 0 ) {
                       //// to check if a file exists /////
            }
            }
             });

    panel.add(btnNewButton_2);

Answer 1

Vector has a contains method which you can use:

if(vector.contains(file)){
   //Vector has the file
}

Answer 2

1. Kindly use the Collections Framework's List for the var types and ArrayList for the concrete class to instantiate. Vector has been a thing of the past since Java 1.2.
2. Iterate over the selected files checking canonical paths at both ends:

final File toCheck = fileToCheckInList.getCanonicalFile();
for (File file : fileChooser.getSelectedFiles())
  if (file.getCanonicalFile().equals(toCheck)) return true;