JTable增刪行列

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

public class JTableDemo7 implements ActionListener{
	
	JTable table = null;
	DefaultTableModel defaultModel = null;
	JButton button1,button2,button3,button4;
	int count = 1;
	public JTableDemo7(){
		JFrame jf = new JFrame();
		String[] name = {"1","2","3"};
		String[][] data = new String[3][3];
		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(300,400));
		JScrollPane scrollPane = new JScrollPane(table);
		
		JPanel panel = new JPanel();
		button1 = new JButton("add new column");
		panel.add(button1);
		button1.addActionListener(this);
		button2 = new JButton("add new row");
		panel.add(button2);
		button2.addActionListener(this);
		panel.add(button2);
		button3 = new JButton("delete row");
		button3.addActionListener(this);
		panel.add(button3);
		button4 = new JButton("delete column");
		button4.addActionListener(this);
		panel.add(button4);

		Container contentPane = jf.getContentPane();
		contentPane.add(panel,BorderLayout.NORTH);
		contentPane.add(scrollPane,BorderLayout.CENTER);
		
		jf.pack();
		jf.setVisible(true);
		jf.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		
	}
	public static void main(String...args){
		new JTableDemo7();
	}
	
	@Override
	public void actionPerformed(ActionEvent e){
		if(e.getSource()==button1){//增加列
			defaultModel.addColumn("NewColumn"+count++);
		}
		if(e.getSource()==button2){//增加行
			defaultModel.addRow(new Vector());
		}
		if(e.getSource()==button4){//刪除列
			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.getSource()==button3){//刪除行
			int rowCount = defaultModel.getRowCount()-1;
			if(rowCount>=0){
				defaultModel.removeRow(rowCount);
				defaultModel.setRowCount(rowCount);
			}
		}
		table.revalidate();
	}
	
	
}