addremovecells.java

《精通Java Swing程序设计S》这本书所附带的JAVA程序写得很漂亮,都是SWING的实例子,很适合初学者。

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

public class AddRemoveCells implements ActionListener
{
    JTable table = null;
    DefaultTableModel defaultModel = null;

    public AddRemoveCells()
    {
       	JFrame f = new JFrame();
       	String[] name = {"字段 1","字段 2","字段 3","字段 4","字段 5"};
       	String[][] data = new String[5][5];
       	int value =1;
       	for(int i=0; i<data.length; i++)
       	{
       	    for(int j=0; j<data[i].length ; j++)
       	        data[i][j] = String.valueOf(value++);
        }
         	        
       	defaultModel = new DefaultTableModel(data,name);
       	table=new JTable(defaultModel);
       	table.setPreferredScrollableViewportSize(new Dimension(400, 80));
        JScrollPane s = new JScrollPane(table);
        
        JPanel panel = new JPanel();
        JButton b = new JButton("增加行");
        panel.add(b);
        b.addActionListener(this);
        b = new JButton("增加列");
        panel.add(b);
        b.addActionListener(this);
        b = new JButton("删除行");
        panel.add(b);
        b.addActionListener(this);
        b = new JButton("删除列");
        panel.add(b);
        b.addActionListener(this);
        
        Container contentPane = f.getContentPane();
        contentPane.add(panel, BorderLayout.NORTH);
        contentPane.add(s, BorderLayout.CENTER);
        
	    f.setTitle("AddRemoveCells");
        f.pack();
        f.setVisible(true);
        
        f.addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {
                System.exit(0);
            }
        });
    }
    
    public void actionPerformed(ActionEvent e)
    {
        if(e.getActionCommand().equals("增加列"))
            defaultModel.addColumn("增加列");
        if(e.getActionCommand().equals("增加行"))
            defaultModel.addRow(new Vector());
        if(e.getActionCommand().equals("删除列"))
        {
            int columncount = defaultModel.getColumnCount()-1;
            if(columncount >= 0)
            {
                TableColumnModel columnModel = table.getColumnModel();
                TableColumn tableColumn = columnModel.getColumn(columncount);
                columnModel.removeColumn(tableColumn);
                defaultModel.setColumnCount(columncount);
            }
        }
        if(e.getActionCommand().equals("删除行"))
        {
            int rowcount = defaultModel.getRowCount()-1;
            if(rowcount >= 0)
            {
                defaultModel.removeRow(rowcount);
                defaultModel.setRowCount(rowcount);
            }
        }
        table.revalidate();
    }
    
    public static void main(String args[]) {
        new AddRemoveCells();
    }
}