BorderLayout布局，修改各个区域大小办法

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BorderLayout控件大小的设置

使用BorderLayout时，中间的面板会随着窗体的变化而变化，其他区域的大小根据添加组件多少而变化。举个例子，现在想将一个面板固定到上边，高度为固定值，这是我们需要设置面板的高度。但是调用面板的 setSize() 方法根本没有效果。调用 setMaximumSize() 和 setMinimumSize() 都没有用。

最后才发现应该调用的是 setPreferredSize() 才能达到效果。

请看栗子。

8 import javax.swing.JFrame; 9 import javax.swing.JPanel; 10 import javax.swing.JTextArea; 11 import javax.swing.JTextField; 13 public class LayoutDemo { 15 public static void main(String[] args) { 16 new myFrame(); 17 } 18 } 20 /** 21 * @author liuyan 22 * 23 */ 24 class myFrame { 26 JFrame jframe = new JFrame("搜索" ); 27 JTextField textField = new JTextField(20 ); 28 JButton jButton = new JButton("转到" ); 29 JButton jButton2 = new JButton("转到2" ); 30 JButton jButton3 = new JButton("转到3" ); 31 JButton jButton4 = new JButton("转到4" ); 32 JTextArea textArea = new JTextArea(); 33 JPanel jPanel = new JPanel( new BorderLayout(5,20 )); 34 JPanel jPanel2 = new JPanel( new BorderLayout()); 35 JPanel jPanel3 = new JPanel( new BorderLayout()); 36 JPanel jPanel4 = new JPanel( new BorderLayout()); 39 /** 40 * 41 */ 42 public myFrame() { 44 init(); 45 } 47 /** 48 * 49 */ 50 private void init() 51 { 52 jframe.setLayout( new BorderLayout()); 53 jframe.add(jPanel2, BorderLayout.SOUTH); 54 jframe.add(jPanel3, BorderLayout.EAST); 55 jframe.add(jPanel4, BorderLayout.WEST); 56 jframe.add(jPanel, BorderLayout.NORTH); 58 jPanel.add(jButton, BorderLayout.EAST); 59 jPanel.add(textField, BorderLayout.CENTER); 61 jPanel2.add(jButton2); 62 jPanel3.add(jButton3); 63 jPanel4.add(jButton4); 65 jPanel.setPreferredSize( new Dimension(0, 150 )); 66 jPanel2.setPreferredSize( new Dimension(0, 150 )); 67 jPanel3.setPreferredSize( new Dimension(150, 0 )); 68 jPanel4.setPreferredSize( new Dimension(150, 0 )); 70 jframe.add(textArea, BorderLayout.CENTER); 72 jframe.setVisible( true ); 73 FrameUtil.initFram(jframe, 500, 700 ); 74 } 75 } 77 class FrameUtil 78 { 79 public static void initFram(JFrame f, int width, int height) 80 { 81 Toolkit toolkit = Toolkit.getDefaultToolkit(); 82 f.setVisible( true ); 83 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 84 Dimension d = toolkit.getScreenSize(); 85 int x = ( int )d.getWidth(); 86 int y = ( int )d.getHeight(); 87 f.setBounds((x-width)/2, (y - height )/2 , width, height); 88 } 8 import javax.swing.JFrame; 9 import javax.swing.JPanel; 10 import javax.swing.JTextArea; 11 import javax.swing.JTextField; 13 public class LayoutDemo { 15 public static void main(String[] args) { 16 new myFrame(); 17 } 18 } 20 /** 21 * @author liuyan 22 * 23 */ 24 class myFrame { 26 JFrame jframe = new JFrame("搜索" ); 27 JTextField textField = new JTextField(20 ); 28 JButton jButton = new JButton("转到" ); 29 JButton jButton2 = new JButton("转到2" ); 30 JButton jButton3 = new JButton("转到3" ); 31 JButton jButton4 = new JButton("转到4" ); 32 JTextArea textArea = new JTextArea(); 33 JPanel jPanel = new JPanel( new BorderLayout(5,20 )); 34 JPanel jPanel2 = new JPanel( new BorderLayout()); 35 JPanel jPanel3 = new JPanel( new BorderLayout()); 36 JPanel jPanel4 = new JPanel( new BorderLayout()); 39 /** 40 * 41 */ 42 public myFrame() { 44 init(); 45 } 47 /** 48 * 49 */ 50 private void init() 51 { 52 jframe.setLayout( new BorderLayout()); 53 jframe.add(jPanel2, BorderLayout.SOUTH); 54 jframe.add(jPanel3, BorderLayout.EAST); 55 jframe.add(jPanel4, BorderLayout.WEST); 56 jframe.add(jPanel, BorderLayout.NORTH); 58 jPanel.add(jButton, BorderLayout.EAST); 59 jPanel.add(textField, BorderLayout.CENTER); 61 jPanel2.add(jButton2); 62 jPanel3.add(jButton3); 63 jPanel4.add(jButton4); 65 // jPanel.setPreferredSize(new Dimension(0, 150)); 66 // jPanel2.setPreferredSize(new Dimension(0, 150)); 67 // jPanel3.setPreferredSize(new Dimension(150, 0)); 68 // jPanel4.setPreferredSize(new Dimension(150, 0)); 70 jframe.add(textArea, BorderLayout.CENTER); 72 jframe.setVisible( true ); 73 FrameUtil.initFram(jframe, 500, 700 ); 74 } 75 } 77 class FrameUtil 78 { 79 public static void initFram(JFrame f, int width, int height) 80 { 81 Toolkit toolkit = Toolkit.getDefaultToolkit(); 82 f.setVisible( true ); 83 f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 84 Dimension d = toolkit.getScreenSize(); 85 int x = ( int )d.getWidth(); 86 int y = ( int )d.getHeight(); 87 f.setBounds((x-width)/2, (y - height )/2 , width, height); 88 }