AWT » AWT FileDialog類

AWT FileDialog類

介紹

FileDialog的控制是指一個對話視窗，使用者可以從中選擇一個檔案。

類的宣告

以下是宣告為java.awt.FileDialog類：

public class FileDialog
   extends Dialog

欄位域

以下java.awt.image類的欄位：

  • static int LOAD -- 此常數的值指示檔案對話方塊視窗的目的是找到要從中讀取資料的檔案。

  • static int SAVE -- 這個常數值表示，這樣做的目的是要找到一個檔案，寫檔案對話方塊視窗。

類別建構函式

S.N. 建構函式& 說明
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.

類方法

S.N. 方法&說明
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.

繼承的方法

這個類繼承的方法從以下類：

  • java.awt.Dialog

  • java.awt.Window

  • java.awt.Component

  • java.lang.Object

Button 範例

選擇使用任何編輯器建立以下java程式D:/ > AWT > com > yiibai > gui >

AwtControlDemo 
package com.yiibai.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 - www.tw511.com");
      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);  
   }
}

編譯程式，使用命令提示字元。到 D:/ > AWT 然後鍵入以下命令。

D:AWT>javac comyiibaiguiAwtControlDemo.java

如果沒有錯誤出現，這意味著編譯成功。使用下面的命令來執行程式。

D:AWT>java com.yiibai.gui.AwtControlDemo

驗證下面的輸出

AWT FileDialog