AWT BorderLayout

介紹

BorderLayout類排列的組成部分，以適應在五個區域：東部，西部，北部，南部和中心。每個區域只能包含一個元件，每個元件在每個區域確定相應的固定 NORTH, SOUTH, EAST, WEST和CENTER.

類的宣告

以下是宣告的java.awt.BorderLayout類：

public class BorderLayout
   extends Object
      implements LayoutManager2, Serializable

欄位域

下面是java.awt.BorderLayout類的欄位：

• static String AFTER_LAST_LINE -- Synonym for PAGE_END.

• static String AFTER_LINE_ENDS -- Synonym for LINE_END.

• static String BEFORE_FIRST_LINE -- Synonym for PAGE_START.

• static String BEFORE_LINE_BEGINS -- Synonym for LINE_START.

• static String CENTER -- The center layout constraint (middle of container).

• static String EAST -- The east layout constraint (right side of container).

• static String LINE_END -- The component goes at the end of the line direction for the layout.

• static String LINE_START -- The component goes at the beginning of the line direction for the layout.

• static String NORTH -- The north layout constraint (top of container).

• static String PAGE_END -- The component comes after the last line of the layout's content.

• static String PAGE_START -- The component comes before the first line of the layout's content.

• static String SOUTH -- The south layout constraint (bottom of container).

• static String WEST -- The west layout constraint (left side of container).

類別建構函式

類方法

繼承的方法

這個類繼承的方法從以下類：

• java.lang.Object

BorderLayout 範例

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

package com.yiibai.gui;

import java.awt.*;
import java.awt.event.*;

public class AwtLayoutDemo {
   private Frame mainFrame;
   private Label headerLabel;
   private Label statusLabel;
   private Panel controlPanel;
   private Label msglabel;

   public AwtLayoutDemo(){
      prepareGUI();
   }

   public static void main(String[] args){
      AwtLayoutDemo  awtLayoutDemo = new AwtLayoutDemo();  
      awtLayoutDemo.showBorderLayoutDemo();       
   }
      
   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);

      msglabel = new Label();
      msglabel.setAlignment(Label.CENTER);
      msglabel.setText("Welcome to TutorialsPoint AWT Tutorial.");

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

      mainFrame.add(headerLabel);
      mainFrame.add(controlPanel);
      mainFrame.add(statusLabel);
      mainFrame.setVisible(true);  
   }

   private void showBorderLayoutDemo(){
      headerLabel.setText("Layout in action: BorderLayout");      

      Panel panel = new Panel();
      panel.setBackground(Color.darkGray);
      panel.setSize(300,300);
      BorderLayout layout = new BorderLayout();
      layout.setHgap(10);
      layout.setVgap(10);
      panel.setLayout(layout);        
	  
      panel.add(new Button("Center"),BorderLayout.CENTER);
      panel.add(new Button("Line Start"),BorderLayout.LINE_START); 
      panel.add(new Button("Line End"),BorderLayout.LINE_END);
      panel.add(new Button("East"),BorderLayout.EAST);   
      panel.add(new Button("West"),BorderLayout.WEST); 
      panel.add(new Button("North"),BorderLayout.NORTH); 
      panel.add(new Button("South"),BorderLayout.SOUTH); 

      controlPanel.add(panel);

      mainFrame.setVisible(true);  
   }
}

編譯程式，使用命令提示字元。進入到D:/> AWT，然後鍵入以下命令。

D:AWT>javac comyiibaiguiAwtlayoutDemo.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.AwtlayoutDemo

驗證下面的輸出