集大小和按鍵

Question

位置有兩個按鈕

left = new JButton("prev"); 
    right = new JButton("next"); 

我將它們添加到JFrame中類似這樣的

mainframe.add(left,BorderLayout.WEST); 
    mainframe.add(right,BorderLayout.EAST); 

但也出現了高度一樣大型機的高度。如何設置我自己的寬度和高度？

以及如何設置其位置（不僅在北部，西部，東部，南部）？

Answer 1

如何設置我自己的寬度和高度

不要做，而不是僅僅使用自身添加到的的EAST或WEST一個JPanel的NORTH或SOUTH限制大小外（父）佈局。

就像這樣：

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

class BorderGUI { 

    BorderGUI() { 
     JPanel gui = new JPanel(new BorderLayout(2,2)); 

     JPanel westConstrain = new JPanel(new BorderLayout(2,2)); 
     // LINE_START will be WEST for l-r languages, otherwise EAST 
     gui.add(westConstrain, BorderLayout.LINE_START); 

     JPanel westControls = new JPanel(new GridLayout(0,1,2,2)); 
     for (int ii=1; ii<3; ii++) { 
      westControls.add(new JButton("" + ii)); 
     } 
     westConstrain.add(westControls, BorderLayout.PAGE_START); 

     JPanel eastConstrain = new JPanel(new BorderLayout(2,2)); 
     gui.add(eastConstrain, BorderLayout.LINE_END); 

     JPanel eastControls = new JPanel(new GridLayout(0,1,2,2)); 
     for (int ii=1; ii<4; ii++) { 
      eastControls.add(new JButton("" + ii)); 
     } 
     // show at the bottom 
     eastConstrain.add(eastControls, BorderLayout.PAGE_END); 

     gui.add(new JScrollPane(new JTextArea(6,10)), BorderLayout.CENTER); 

     JOptionPane.showMessageDialog(null, gui); 
    } 

    public static void main(String[] args) { 
     EventQueue.invokeLater(new Runnable() { 

      @Override 
      public void run() { 
       new BorderGUI(); 
      } 
     }); 
    } 
}