Swing JFrame類

JFrame類是java.awt.Frame的擴展版本，它增加了對JFC/Swing組件體系結構的支持。

類聲明

以下是javax.swing.JFrame類的聲明 -

public class JFrame
   extends Frame
      implements WindowConstants, Accessible, RootPaneContainer

字段

以下是java.awt.Component類的字段 -

• protected AccessibleContext accessibleContext - 可訪問的上下文屬性。
• static int EXIT_ON_CLOSE - 退出應用程式默認窗口關閉操作。
• protected JRootPane rootPane - 管理此框架的contentPane和可選menuBar的JRootPane實例。
• protected boolean rootPaneCheckingEnabled - 如果為true，則對add和setLayout方法的調用將轉發到contentPane。

類構造函數

類方法

方法繼承

該類繼承以下類中的方法 -

• java.awt.Frame
• java.awt.Window
• java.awt.Container
• java.awt.Component
• java.lang.Object

JFrame示例

使用編輯器創建以下Java程式：JFrameDemo.java

package com.zaixian.menu;


import java.awt.*;
import java.awt.event.*;
import javax.swing.*;

public class JFrameDemo {
   private JFrame mainFrame;
   private JLabel headerLabel;
   private JLabel statusLabel;
   private JPanel controlPanel;
   private JLabel msglabel;

   public JFrameDemo(){
      prepareGUI();
   }
   public static void main(String[] args){
       JFrameDemo  swingContainerDemo = new JFrameDemo();
      swingContainerDemo.showJFrameDemo();
   }
   private void prepareGUI(){
      mainFrame = new JFrame("Java Swing JFrameDemo(示例)");
      mainFrame.setSize(400,400);
      mainFrame.setLayout(new GridLayout(3, 1));

      mainFrame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            System.exit(0);
         }
      });
      headerLabel = new JLabel("", JLabel.CENTER);
      statusLabel = new JLabel("",JLabel.CENTER);
      statusLabel.setSize(350,100);
      msglabel = new JLabel("歡迎您來到許虎虎~", JLabel.CENTER);

      controlPanel = new JPanel();
      controlPanel.setLayout(new FlowLayout());

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);
   }
   private void showJFrameDemo(){
      headerLabel.setText("Container in action: JFrame");
      final JFrame frame = new JFrame();
      frame.setSize(300, 300);
      frame.setLayout(new FlowLayout());
      frame.add(msglabel);

      frame.addWindowListener(new WindowAdapter() {
         public void windowClosing(WindowEvent windowEvent){
            frame.dispose();
         }
      });
      JButton okButton = new JButton("打開Frame");
      okButton.addActionListener(new ActionListener() {
         public void actionPerformed(ActionEvent e) {
            statusLabel.setText("A Frame shown to the user.");
            frame.setVisible(true);
         }
      });
      controlPanel.add(okButton);
      mainFrame.setVisible(true);
   }
}

執行上面示例代碼，得到以下結果：