布局一例

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import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.util.Vector;
import javax.swing.table.DefaultTableModel;

/**
* 該示例使用
* 邊界布局(BorderLayout:分為東南西北中，第個地方只能放置一個組件)
* 為背景，然后是各個布局塊內再分別使用
* 流布局(FlowLayout:典型的用于按鈕布局，從水平方向放置，當不能夠擺放更多的時候，就自動換動)
* 網格布局(GridLayout:將面板分成大小相等的格子，如:setLayout(new GridLayout(3,2));就是將
* 其分成三行兩列的形式存放元件)
*/
public class LayoutExample
extends JFrame
{
BorderLayout borderLayout1 = new BorderLayout();
JPanel jPanel1 = new JPanel();
JPanel jPanel2 = new JPanel();
JPanel jPanel3 = new JPanel();
JLabel jLabel1 = new JLabel();
JTextField jTextField1 = new JTextField();
JButton jButton1 = new JButton();
FlowLayout flowLayout1 = new FlowLayout();
FlowLayout flowLayout2 = new FlowLayout();
JButton jButton2 = new JButton();
JButton jButton3 = new JButton();
JButton jButton4 = new JButton();
GridLayout gridLayout1 = new GridLayout();
JScrollPane jScrollPane1 = new JScrollPane();
JTable jTable1 = new JTable();

public LayoutExample()
{
    try
    {
      jbInit();
    }
    catch (Exception e)
    {
      e.printStackTrace();
    }
}

public static void main(String[] args)
{
    try
    {
      UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
    }
    catch (Exception exemp)
    {
      exemp.printStackTrace();
    }
    LayoutExample frame1 = new LayoutExample();
    frame1.setSize(new Dimension(400, 350));
    frame1.setVisible(true);

}

private void jbInit()
    throws Exception
{
    this.getContentPane().setLayout(borderLayout1);
    jPanel1.setBackground(Color.red);
    jPanel1.setLayout(flowLayout1);
    jPanel2.setBackground(Color.red);
    jPanel2.setLayout(flowLayout2);
    jPanel3.setBackground(Color.pink);
    jPanel3.setLayout(gridLayout1);
    jLabel1.setPreferredSize(new Dimension(100, 16));
    jLabel1.setText("请输入查询条件");
    jTextField1.setPreferredSize(new Dimension(140, 22));
    jTextField1.setText("");
    jButton1.setText("查询");
    jButton1.addActionListener(new ActionListener()
        {
          public void actionPerformed(ActionEvent e)
          {
            jButton1_actionPerformed(e);
          }
        });
    flowLayout1.setAlignment(FlowLayout.LEFT);
    flowLayout1.setHgap(5);
    flowLayout1.setVgap(10);
    jButton2.setText("增加");
    jButton3.setText("删除");
    jButton4.setText("修改");
    flowLayout2.setHgap(30);
    flowLayout2.setVgap(5);
    this.setDefaultCloseOperation(EXIT_ON_CLOSE);
    this.getContentPane().add(jPanel1, BorderLayout.NORTH);
    jPanel1.add(jLabel1, null);
    jPanel1.add(jTextField1, null);
    jPanel1.add(jButton1, null);
    this.getContentPane().add(jPanel2, BorderLayout.SOUTH);
    jPanel2.add(jButton2, null);
    jPanel2.add(jButton3, null);
    jPanel2.add(jButton4, null);
    this.getContentPane().add(jPanel3, BorderLayout.CENTER);
    jPanel3.add(jScrollPane1, null);
    jScrollPane1.getViewport().add(jTable1, null);
}

//模擬查詢數據庫

void jButton1_actionPerformed(ActionEvent e)
{
    try
    { //制作表
      Vector vcol = new Vector(); //列名
      Vector vrow = new Vector(); //內容
      for (int col = 1; col < 31; col++)
      {
        vcol.addElement("列" + col);
      }
      for (int row = 1; row < 101; row++)
      {
        Vector vr1 = new Vector();
        for (int col = 1; col < 31; col++)
        {
          vr1.addElement(row + "/" + col);
        }
        vrow.addElement(vr1);
      }
      DefaultTableModel dtm = new DefaultTableModel(vrow, vcol);
      jTable1 = new JTable(vrow, vcol);
      jTable1.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); //滚动条设置左右滚
      this.jScrollPane1.getViewport().add(jTable1, null); //在滚动条中放入表
    }
    catch (Exception ex)
    {
      JOptionPane.showMessageDialog(null, ex);
    }
}

}