Introduction
FileDialog class control represents a dialog window from which the user can select a file.
Class declaration
Following is the declaration for java.awt.FileDialog class:
public class FileDialog extends Dialog
Field
Following are the fields for java.awt.Image class:
- static int LOAD — This constant value indicates that the purpose of the file dialog window is to locate a file from which to read.
- static int SAVE — This constant value indicates that the purpose of the file dialog window is to locate a file to which to write.
Class constructors
| S.N. | Constructor & Description |
|---|---|
| 1 | FileDialog(Dialog parent)Creates a file dialog for loading a file. |
| 2 | FileDialog(Dialog parent, String title)Creates a file dialog window with the specified title for loading a file. |
| 3 | FileDialog(Dialog parent, String title, int mode)Creates a file dialog window with the specified title for loading or saving a file. |
| 4 | FileDialog(Frame parent)Creates a file dialog for loading a file. |
| 5 | FileDialog(Frame parent, String title)Creates a file dialog window with the specified title for loading a file. |
| 6 | FileDialog(Frame parent, String title, int mode)Creates a file dialog window with the specified title for loading or saving a file. |
Class methods
| S.N. | Method & Description |
|---|---|
| 1 | void addNotify()Creates the file dialog’s peer. |
| 2 | String getDirectory()Gets the directory of this file dialog. |
| 3 | String getFile()Gets the selected file of this file dialog. |
| 4 | FilenameFilter getFilenameFilter()Determines this file dialog’s filename filter. |
| 5 | int getMode()Indicates whether this file dialog box is for loading from a file or for saving to a file. |
| 6 | protected String paramString()Returns a string representing the state of this FileDialog window. |
| 7 | void setDirectory(String dir)Sets the directory of this file dialog window to be the specified directory. |
| 8 | void setFile(String file)Sets the selected file for this file dialog window to be the specified file. |
| 9 | void setFilenameFilter(FilenameFilter filter)Sets the filename filter for this file dialog window to the specified filter. |
| 10 | void setMode(int mode)Sets the mode of the file dialog. |
Methods inherited
This class inherits methods from the following classes:
- java.awt.Dialog
- java.awt.Window
- java.awt.Component
- java.lang.Object
FileDialog Example
Create the following java program using any editor of your choice in say D:/ > AWT > com > adglob > gui >AwtControlDemo.java
package com.adglob.gui;
import java.awt.*;
import java.awt.event.*;
public class AwtControlDemo {
private Frame mainFrame;
private Label headerLabel;
private Label statusLabel;
private Panel controlPanel;
public AwtControlDemo(){
prepareGUI();
}
public static void main(String[] args){
AwtControlDemo awtControlDemo = new AwtControlDemo();
awtControlDemo.showFileDialogDemo();
}
private void prepareGUI(){
mainFrame = new Frame("Java AWT Examples");
mainFrame.setSize(400,400);
mainFrame.setLayout(new GridLayout(3, 1));
mainFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent windowEvent){
System.exit(0);
}
});
headerLabel = new Label();
headerLabel.setAlignment(Label.CENTER);
statusLabel = new Label();
statusLabel.setAlignment(Label.CENTER);
statusLabel.setSize(350,100);
controlPanel = new Panel();
controlPanel.setLayout(new FlowLayout());
mainFrame.add(headerLabel);
mainFrame.add(controlPanel);
mainFrame.add(statusLabel);
mainFrame.setVisible(true);
}
private void showFileDialogDemo(){
headerLabel.setText("Control in action: FileDialog");
final FileDialog fileDialog = new FileDialog(mainFrame,"Select file");
Button showFileDialogButton = new Button("Open File");
showFileDialogButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
fileDialog.setVisible(true);
statusLabel.setText("File Selected :"
+ fileDialog.getDirectory() + fileDialog.getFile());
}
});
controlPanel.add(showFileDialogButton);
mainFrame.setVisible(true);
}
}
Compile the program using command prompt. Go to D:/ > AWT and type the following command.
D:\AWT>javac com\adglob\gui\AwtControlDemo.java
If no error comes that means compilation is successful. Run the program using following command.
D:\AWT>java com.adglob.gui.AwtControlDemo
Verify the following output
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