如何让GridBagLayout定位左上角

Question

我想让gridbaglayout在我的JFrame的左上角开始。我试图使用JFrame内的面板来解决问题。它不起作用，它给了我和以前一样的结果。我得到我想要放置在左上角的面板，它始于中心并始终离开。 GUI problem picture 这是我的课程和代码。

public class GraphMatchApp extends JApplet implements ActionListener 
{ 
    private JFrame mFrame; 
    private JPanel mBusinessPanel; 
    private JPanel mItemsPanel; 
    private JTabbedPane mTabbedPane; 
    private JPanel mFramePanel; 
    GridBagConstraints mGridBagConstaints; 


    public GraphMatchApp() 
    { 
     prepairMainFrame(); 
     prepairBusinessPanel(); 
     mGridBagConstaints.fill = GridBagConstraints.HORIZONTAL; 
     mGridBagConstaints.weightx = 0.5; 
     mGridBagConstaints.gridx = 0; 
     mGridBagConstaints.gridy = 0; 
     mGridBagConstaints.anchor = GridBagConstraints.FIRST_LINE_START; 
     mFramePanel.add(mBusinessPanel,mGridBagConstaints); 
     mFrame.setVisible(true); 
    } 
    public void prepairMainFrame() 
    { 
     mFrame = new JFrame(); 
     mFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
     mFrame.setTitle("Test"); 

     mFrame.setSize(400,200); 
     mFramePanel = new JPanel(); 
     mFramePanel.setLayout(new GridBagLayout()); 
     mFrame.add(mFramePanel, BorderLayout.LINE_START); 
     mGridBagConstaints = new GridBagConstraints(); 
    } 
    public void prepairBusinessPanel() 
    { 
     mBusinessPanel = new JPanel(); 
     Border border = BorderFactory.createEtchedBorder(); 
     border = BorderFactory.createTitledBorder(border,"What is your ?"); 
     mBusinessPanel.setBorder(border); 
     JRadioButton logisticsButton = new JRadioButton("Logistics"); 
     logisticsButton.setMnemonic(KeyEvent.VK_L); 
     logisticsButton.setActionCommand("SelectionLogistics"); 
     logisticsButton.setSelected(false); 

     JRadioButton healthCareButton = new JRadioButton("Health care"); 
     healthCareButton.setMnemonic(KeyEvent.VK_H); 
     healthCareButton.setActionCommand("SelectionHealthCare"); 
     healthCareButton.setSelected(false); 

     JRadioButton transportationButton = new JRadioButton("Transp"); 
     transportationButton.setMnemonic(KeyEvent.VK_T); 
     transportationButton.setActionCommand("SelectionTransportation"); 
     transportationButton.setSelected(false); 

     ButtonGroup group = new ButtonGroup(); 
     group.add(logisticsButton); 
     group.add(healthCareButton); 
     group.add(transportationButton); 

     logisticsButton.addActionListener(this); 
     healthCareButton.addActionListener(this); 
     transportationButton.addActionListener(this); 

     mBusinessPanel.add(logisticsButton); 
     mBusinessPanel.add(healthCareButton); 
     mBusinessPanel.add(transportationButton); 
    } 
    public static void main(String[] args) 
    { 
     new GraphMatchApp(); 
    } 

Answer 1

在你的构造，设置mGridBagConstaints.weighty = 0.5;

面板，然后只需要一半的帧的可用空间。