JCombo Box在java中的定位

Question

我想以下圖所示的方式定位JComboBox。我想知道是否有簡單的代碼來實現這一目標？

Answer 1

import java.awt.*; 
import javax.swing.*; 
import javax.swing.border.EmptyBorder; 

public class CenteredCombos { 

    public static void main(String[] args) { 
     Runnable r = new Runnable() { 

      @Override 
      public void run() { 
       String[] values = {"Dog","Cat"}; 
       // put the controls in a single column, with a little space. 
       JPanel controlPanel = new JPanel(new GridLayout(0,1,5,5)); 
       for (int ii=0; ii<4; ii++) { 
        controlPanel.add(new JComboBox(values)); 
       } 

       // the GUI as seen by the user (without frame) 
       // The GBL is used to center the controlPanel 
       JPanel gui = new JPanel(new GridBagLayout()); 
       gui.setBorder(new EmptyBorder(2, 3, 2, 3)); 
       gui.add(controlPanel); 

       // Make the BG panel more clear.. 
       gui.setBackground(Color.WHITE); 

       JFrame f = new JFrame("Demo"); 
       f.add(gui); 
       // Ensures JVM closes after frame(s) closed and 
       // all non-daemon threads are finished 
       f.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE); 
       // See http://stackoverflow.com/a/7143398/418556 for demo. 
       f.setLocationByPlatform(true); 

       // ensures the frame is the minimum size it needs to be 
       // in order display the components within it 
       f.pack(); 
       // should be done last, to avoid flickering, moving, 
       // resizing artifacts. 
       f.setVisible(true); 
      } 
     }; 
     // Swing GUIs should be created and updated on the EDT 
     // http://docs.oracle.com/javase/tutorial/uiswing/concurrency/initial.html 
     SwingUtilities.invokeLater(r); 
    } 
} 

Answer 2

使用適當的佈局管理器，例如BoxLayout。欲瞭解更多信息，請參閱How to Use BoxLayout。

Answer 3

你可以使用MigLayout與像[max][min][max]行和列的限制 - 會分裂你的根面板與「貪婪」邊境一個3x3的網格，並且在中間區域（那個那分/分鐘）下降一個JPanel有垂直flow layout，在其中您可以添加您的組件