The steps to create a simple open file dialog using JFileChooser class are as follows:

  1. Add required import statements:
            import javax.swing.JFileChooser;
            import java.io.File;        
            
  2. Create a new instance ofJFileChooser class:
            JFileChooser fileChooser = new JFileChooser();
            
  3. Set current directory:
            fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
            
    The current directory is initial directory where the dialog looks for files. The above line sets the current directory to user’s home directory.
  4. Show up the dialog:
            
            int result = fileChooser.showOpenDialog(parent);
    
    where parent is an instance of a Component such as JFrame, JDialog or JPanelwhich is parent of the dialog.
  5. Check if the user selects a file or not:
    If the user selects a file, the variable result will hold a value of JFileChooser.APPROVE_OPTION. So it’s necessary to check return value of the method showOpenDialog():
            
            if (result == JFileChooser.APPROVE_OPTION) {
                // user selects a file
            }
    
  6. Pick up the selected file:
            
                File selectedFile = fileChooser.getSelectedFile();
    
  7. And the whole code snippet is as follows:
            
            JFileChooser fileChooser = new JFileChooser();
            fileChooser.setCurrentDirectory(new File(System.getProperty("user.home")));
            int result = fileChooser.showOpenDialog(this);
            if (result == JFileChooser.APPROVE_OPTION) {
                File selectedFile = fileChooser.getSelectedFile();
                System.out.println("Selected file: " + selectedFile.getAbsolutePath());
            } 

 

Learn Advanced Swing techniques in Core Java, Volume II--Advanced Features (9th Edition)

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