错误: 找不到或无法加载主类 com.lin.BorderTest　　求解决办法
最近从《Core Java》上看到一个示例程序，在我的电脑上用Eclipse练习了一下，却出现了下面的错误提示，不知道哪位大侠能帮忙解答一下？



程序如下：

package com.lin;

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

import javax.swing.border.*;



public class BorderTest {



	/**

	 * @param args

	 */

	public static void main(String[] args) {

		// TODO Auto-generated method stub

		EventQueue.invokeLater(new Runnable(){

			public void run(){

				BorderFrame frame=new BorderFrame();

				frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

				frame.setVisible(true);

			}

		});

	}

}



class BorderFrame extends JFrame{

	public BorderFrame(){

		setTitle("BorderTest");

		setSize(DEFAULT_WIDTH,DEFAULT_HEIGHT);

		

		demoPanel=new JPanel();

		buttonPanel=new JPanel();

		group=new ButtonGroup();

	

		addRadioButton("Lowered bevel",BorderFactory.createLoweredBevelBorder());

		addRadioButton("Raised bevel",BorderFactory.createRaisedBevelBorder());

		addRadioButton("Etched",BorderFactory.createEtchedBorder());

		addRadioButton("Line",BorderFactory.createLineBorder(Color.BLUE));

		addRadioButton("Matte",BorderFactory.createMatteBorder(10,10,10,10,Color.BLUE));

		addRadioButton("Empty",BorderFactory.createEmptyBorder());

		

		Border etched=BorderFactory.createEtchedBorder();

		Border titled=BorderFactory.createTitledBorder(etched,"Border types");

		buttonPanel.setBorder(titled);

		

		setLayout(new GridLayout(2,1));

		add(buttonPanel);

		add(demoPanel);

	}

	

	public void addRadioButton(String buttonName,final Border b){

		JRadioButton button=new JRadioButton(buttonName);

		button.addActionListener(new ActionListener(){

			public void actionPerformed(ActionEvent e){

				demoPanel.setBorder(b);

			}

		});

		group.add(button);

		buttonPanel.add(button);

	}

	

	public static final int DEFAULT_WIDTH=400;

	public static final int DEFAULT_HEIGHT=200;

	

	private JPanel demoPanel;

	private JPanel buttonPanel;

	private ButtonGroup group;

}

------解决方案--------------------
你环境变量没设对吧？