將兩個JToolBar添加到邊界佈局。

Question

我對Java相當陌生，所以我希望我不會讓我的問題複雜化。

基本上我試圖將兩個JToolbar垂直地添加到一個邊界佈局的北容器中。但是，我不認爲你可以添加多個JToolbar到一個邊界佈局中的單個位置容器，所以我可能的解決方案，我想這將是在borderlayout中嵌入borderlayout，並將其放置在北部和另一個在中心，但我不知道如何實現這一目標。任何建議是什麼是達到這個最好的解決方案將不勝感激。

下面是我的程序的源代碼。爲了讓我的程序運行，第二個JToolbar我也想在「bar」下定位JToolbar已經放置在南方的容器中。

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

public class FeedBar2 extends JFrame { 

public FeedBar2() { 
    super("FeedBar 2"); 
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
    // create icons 
    ImageIcon loadIcon = new ImageIcon("load.gif"); 
    ImageIcon saveIcon = new ImageIcon("save.gif"); 
    ImageIcon subscribeIcon = new ImageIcon("subscribe.gif"); 
    ImageIcon unsubscribeIcon = new ImageIcon("unsubscribe.gif"); 
    // create buttons 
    JButton load = new JButton("Load", loadIcon); 
    JButton save = new JButton("Save", saveIcon); 
    JButton subscribe = new JButton("Subscribe", subscribeIcon); 
    JButton unsubscribe = new JButton("Unsubscribe", unsubscribeIcon); 

    //create help buttons 
    JButton help = new JButton("Help"); 
    JButton about = new JButton("About"); 
    JButton contact = new JButton("Contact Us"); 

    // add buttons to toolbar 
    JToolBar bar = new JToolBar(); 
    bar.add(load); 
    bar.add(save); 
    bar.add(subscribe); 
    bar.add(unsubscribe); 

    //add buttons to help toolbar 
    JToolBar helpbar = new JToolBar(); 
    helpbar.add(help); 
    helpbar.add(about); 
    helpbar.add(contact); 

    // create dropdown menu 
    JMenuItem j1 = new JMenuItem("Load"); 
    JMenuItem j2 = new JMenuItem("Save"); 
    JMenuItem j3 = new JMenuItem("Subscribe"); 
    JMenuItem j4 = new JMenuItem("Unsubscribe"); 
    JMenuItem h1 = new JMenuItem("Help"); 
    JMenuItem h2 = new JMenuItem("About"); 
    JMenuItem h3 = new JMenuItem("Contact Us"); 
    JMenuBar menubar = new JMenuBar(); 
    JMenuBar helpmenubar = new JMenuBar(); 
    JMenu menu = new JMenu("Feeds"); 
    menu.add(j1); 
    menu.add(j2); 
    menu.addSeparator(); 
    menu.add(j3); 
    menu.add(j4); 


    JMenu helpmenu = new JMenu("Help"); 
    helpmenu.add(h1); 
    helpmenu.add(h2); 
    helpmenu.add(h3); 
    menubar.add(menu); 
    menubar.add(helpmenu); 

    // prepare user interface 
    JTextArea edit = new JTextArea(8, 40); 

    JScrollPane scroll = new JScrollPane(edit); 

    BorderLayout bord = new BorderLayout(); 


    //Looking for the "help bar" to be vertically placed under the "bar" 
    //toolbar. 

    setLayout(bord); 
    add("North", bar); 
    add("Center", scroll); 
    add("South", helpbar); 

    setJMenuBar(menubar); 



    pack(); 
    setVisible(true); 
} 

public static void main(String[] arguments) { 
    FeedBar2 frame = new FeedBar2(); 
} 

Answer 1

我會用一個網格佈局：

//setLayout(bord); // the default layout of a frame is a BorderLayout 
//add("North", bar); // don't use String literals, the API has variables for you to use 
//add("Center", scroll); 
//add("South", helpbar); 


JPanel toolbars = new JPanel(new GridLayout(0, 1)); 
toolbars.add(bar); 
toolbars.add(helpBar); 

add(toolBars, BorderLayout.NORTH) 
add(scroll, BorderLayout.CENTER);