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初学者的问题，程序能运行，警告提示不明白是什么？

摘要: 初学者的问题，程序能运行，警告提示不明白是什么？

我现在用的eclipse3.1
以下是源代码，运行到是没问题，但就是在第四行（public class mJFrm extends JFrame）有个警告提示：The serializable class mFrm does not declare a static final serialVersionUID field of type long

不知道是什么原因，那位能帮我解释一下，谢谢了先！！！


//import java.lang.*;
import java.awt.*;
import javax.swing.*;
public class mJFrm extends JFrame
{
JLabel L1;
JTextField T1;
JButton B1;
JButton B2;
public mJFrm()
{
L1=new JLabel("输入您的代号：");
L1.setBounds(40,50,80,25);
this.getContentPane().add(L1);
T1 = new JTextField("在这里输入：");
T1.setBounds(125,50,90,25);
this.getContentPane().add(T1);
B1 = new JButton("Button1");
B2 = new JButton("Button2");
B1.setBounds(25,50,90,25);
B2.setBounds(125,50,90,25);
this.getContentPane().add(B1);
this.getContentPane().add(B2);

this.setBounds(0,0,300,250);
this.setBackground(Color.blue);
this.setTitle("This is my first JForm!");
this.setVisible(true);

}
public static void main(String[] para)
{
new mJFrm();

}

}

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The serialization runtime associates with each serializable class a version number, called a serialVersionUID, which is used during deserialization to verify that the sender and receiver of a serialized object have loaded classes for that object that are compatible with respect to serialization. If the receiver has loaded a class for the object that has a different serialVersionUID than that of the corresponding sender's class, then deserialization will result in an InvalidClassException. A serializable class can declare its own serialVersionUID explicitly by declaring a field named "serialVersionUID" that must be static, final, and of type long:


ANY-ACCESS-MODIFIER static final long serialVersionUID = 42L;

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这个值的用途见楼上，在这只是一个Warning，而非Error，你可以在编译器设置中忽略“Serializable class without serialVersionUID”这个选项。

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楼上的说得对，可惜我来晚了

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先谢谢楼上几位！！
晕，一楼帖的全是英文，我看不懂。
能不能给翻译一下？
再次感谢！

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