java小通信录的一个错误

[wx3046]

下面是全部的代码
用的eclipse，错误提示：
java.lang.NoSuchMethodError: main
Exception in thread "main"

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;

public class Tongxuelu extends JFrame
{
	JPanel cp = new JPanel();
	JTabbedPane jtp = new JTabbedPane();   //定义分页面板对象
	JPanel jp1 = new JPanel();             //定义面板对象，做为分页使用
	JPanel jp2 = new JPanel();
	JPanel jp3 = new JPanel();

  	JButton jb2 = new JButton("请点击这里查看信息");
  	Label l2 = new Label(" 输入姓名: ");
    Label l3 = new Label(" 输入电话:");
    Label l4 = new Label(" 输入EMAIL:");
    Label l5 = new Label(" 输入其他:");
    TextField tf2 = new TextField(50);
    TextField tf3 = new TextField(50);
    TextField tf4 = new TextField(50);
    TextField tf5 = new TextField(50);
    JButton b3 = new JButton("录入",new ImageIcon("14.gif"));
    JButton b4 = new JButton("清除",new ImageIcon("39.gif"));
    TextArea ta1 = new TextArea("姓名            电话              EMAIL                          其他 \n*****          ******-******      *****@yahoo.com.cn     相信自己！去做事吧！一切都会有改变!!!\n ",18,40);
  
    public Tongxuelu()               //窗口Tongxuelu的构造函数
    {	
    	setTitle("****通讯系统欢迎欢迎您的光临！！！");
    	setSize(500,400);
    	
    	this.addWindowListener(new WindowAdapter()
    	{
    		public void  windowClosing(WindowEvent e)
    		{
    			System.exit(0);
    		}
    	});
    	
    	Container cp = this.getContentPane();     //取得Tongxuelu类的容器框架
    	ImageIcon icon = new ImageIcon("middle.gif");   //定义图标
	
    	jp1.setLayout(new FlowLayout());   //设计jp1的布局
    	jp1.setBackground(Color.cyan);     
	 
    	jp1.add(l2);
    	jp1.add(tf2);
    	jp1.add(l3);
    	jp1.add(tf3);
    	jp1.add(l4);
    	jp1.add(tf4);
    	jp1.add(l5);
    	jp1.add(tf5); 
    	jp1.add(b3);
    	jp1.add(b4);
	  
    	b3.addActionListener(new qq());
    	b4.addActionListener(new kv());     //添加相应的监听者
    	jb2.addActionListener(new mm());
    	
    	jp2.setLayout(new BorderLayout());     //设计jp2的布局
    	jp2.add("North",jb2);
    	jp2.add("Center",ta1);
    	jtp.add(jp1,0);
    	jtp.setTitleAt(0,"输入信息");
	
    	jtp.addTab("查看信息",icon,jp2,"落霞与孤鹜齐飞，秋水共长天一色");
    	jtp.setSelectedIndex(0);
	   
    	jtp.addChangeListener(new ChangeListener()
    	{
    		public void stateChanged(ChangeEvent e)
    		{
			   jtpState(e);
    		}
    	});
    	cp.add(jtp);
}

class kv implements ActionListener{             //类kv用来实现“清除”功能
	public void actionPerformed(ActionEvent e)
	{
		Object source = e.getSource();
		if(source == b4)
		{
			tf2.setText("");
			tf3.setText("");
			tf4.setText("");
			tf5.setText("");
		}
	}
}

class qq implements ActionListener{          //类 qq用来实现将用户输入的数据写如到文件中
	public void actionPerformed(ActionEvent e){
		Object source = e.getSource();
		if(source == b3)
		try 
		{ 
			File fw = new File("java123.doc");
			RandomAccessFile out = new RandomAccessFile(fw,"rw"); 
			
			if(fw.exists()) 
			{ 
				long length = fw.length(); 
				out.seek(length);//定位文件读写指针到文件末尾，以免覆盖原来的数据； 
			} 
			
			if(tf2.getText().equals("")) 
			{ 
			}
			
			else
			{
			  out.writeUTF(tf2.getText()+"          "+tf3.getText()+"      "+tf4.getText()+"     "+tf5.getText()); 
			  out.close(); 
			}
		}
		catch(IOException ee) 
		{ 
		} 
	}
}

class mm implements ActionListener         //类mm用来实现将数据从文件读如到文本区域中
{	
	public void actionPerformed(ActionEvent e)
	{
		String s = "";
		Object source = e.getSource();
		if(source == jb2)
		{	
			try 
			{
				int number = 1;
				File fw = new File("java123.doc");
				RandomAccessFile in = new RandomAccessFile(fw,"rw");
				String xingming = null; 
				ta1.setText(null); 
				
				while((xingming = in.readUTF()) != null) 
				{ 
					ta1.append("\n"+number+". " +xingming); 
					number++; 
				} 
				
				in.close(); 
			} 
			catch(Exception ee) 
			{ 
			}
		}
	}
	
	public void main(String[] args) 
	{
	    Tongxuelu tabpane2 = new Tongxuelu();
	    tabpane2.setVisible(true);
	}

	void jtpState(ChangeEvent e)        //处理ChangeEvent 事件的方法
	{
		String s = new String();
		jp3 =(JPanel)jtp.getSelectedComponent();   //取得被选分页
	}
}}

[wanglingzhong]

main方法必须声明为static的

[wanglingzhong]

还有你的内部类mm中括号加错位置了！

[一步一个脚印]

public static void main(String[] args) {
//....
}
你没有main函数,内部类mm倒是有个,你应该把mm.main(..)放到类似Tongxuelu.main(..)下

[wx3046]

能否具体点不..我看了还是不会改.main方法已经改成static了,那个括号是我故意加的，因为我不加括号他就提示结尾不正确了。.

[lwater1]

[Quote=引用 5 楼 wx3046 的回复:]
那个大大帮我改一下代码，老改不对，谢谢
[/Quote]

import java.io.*;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import javax.swing.event.*;

public class Tongxuelu extends JFrame
{
JPanel cp = new JPanel();
JTabbedPane jtp = new JTabbedPane(); //定义分页面板对象
JPanel jp1 = new JPanel(); //定义面板对象，做为分页使用
JPanel jp2 = new JPanel();
JPanel jp3 = new JPanel();

JButton jb2 = new JButton("请点击这里查看信息");
Label l2 = new Label(" 输入姓名: ");
Label l3 = new Label(" 输入电话:");
Label l4 = new Label(" 输入EMAIL:");
Label l5 = new Label(" 输入其他:");
TextField tf2 = new TextField(50);
TextField tf3 = new TextField(50);
TextField tf4 = new TextField(50);
TextField tf5 = new TextField(50);
JButton b3 = new JButton("录入",new ImageIcon("14.gif"));
JButton b4 = new JButton("清除",new ImageIcon("39.gif"));
TextArea ta1 = new TextArea("姓名 电话 EMAIL 其他 \n***** ******-****** *****@yahoo.com.cn 相信自己！去做事吧！一切都会有改变!!!\n ",18,40);

public Tongxuelu() //窗口Tongxuelu的构造函数
{
setTitle("****通讯系统欢迎欢迎您的光临！！！");
setSize(500,400);

this.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent e)
{
System.exit(0);
}
});

Container cp = this.getContentPane(); //取得Tongxuelu类的容器框架
ImageIcon icon = new ImageIcon("middle.gif"); //定义图标

jp1.setLayout(new FlowLayout()); //设计jp1的布局
jp1.setBackground(Color.cyan);

jp1.add(l2);
jp1.add(tf2);
jp1.add(l3);
jp1.add(tf3);
jp1.add(l4);
jp1.add(tf4);
jp1.add(l5);
jp1.add(tf5);
jp1.add(b3);
jp1.add(b4);

b3.addActionListener(new qq());
b4.addActionListener(new kv()); //添加相应的监听者
jb2.addActionListener(new mm());

jp2.setLayout(new BorderLayout()); //设计jp2的布局
jp2.add("North",jb2);
jp2.add("Center",ta1);
jtp.add(jp1,0);
jtp.setTitleAt(0,"输入信息");

jtp.addTab("查看信息",icon,jp2,"落霞与孤鹜齐飞，秋水共长天一色");
jtp.setSelectedIndex(0);

jtp.addChangeListener(new ChangeListener()
{
public void stateChanged(ChangeEvent e)
{
jtpState(e);
}
});
cp.add(jtp);
}

class kv implements ActionListener{ //类kv用来实现“清除”功能
public void actionPerformed(ActionEvent e)
{
Object source = e.getSource();
if(source == b4)
{
tf2.setText("");
tf3.setText("");
tf4.setText("");
tf5.setText("");
}
}
}

class qq implements ActionListener{ //类 qq用来实现将用户输入的数据写如到文件中
public void actionPerformed(ActionEvent e){
Object source = e.getSource();
if(source == b3)
try
{
File fw = new File("java123.doc");
RandomAccessFile out = new RandomAccessFile(fw,"rw");

if(fw.exists())
{
long length = fw.length();
out.seek(length);//定位文件读写指针到文件末尾，以免覆盖原来的数据；
}

if(tf2.getText().equals(""))
{
}

else
{
out.writeUTF(tf2.getText()+" "+tf3.getText()+" "+tf4.getText()+" "+tf5.getText());
out.close();
}
}
catch(IOException ee)
{
}
}
}

class mm implements ActionListener //类mm用来实现将数据从文件读如到文本区域中
{
public void actionPerformed(ActionEvent e)
{
String s = "";
Object source = e.getSource();
if(source == jb2)
{
try
{
int number = 1;
File fw = new File("java123.doc");
RandomAccessFile in = new RandomAccessFile(fw,"rw");
String xingming = null;
ta1.setText(null);

while((xingming = in.readUTF()) != null)
{
ta1.append("\n"+number+". " +xingming);
number++;
}

in.close();
}
catch(Exception ee)
{
}
}
}
} //少了个}
public static void main(String args[]) //加了static
{
Tongxuelu tabpane2 = new Tongxuelu();
tabpane2.setVisible(true);
}

void jtpState(ChangeEvent e) //处理ChangeEvent 事件的方法
{
String s = new String();
jp3 =(JPanel)jtp.getSelectedComponent(); //取得被选分页
}
}

[wx3046]

非常感谢

[wx3046]

那个大大帮我改一下代码，老改不对，谢谢