import java.awt.*;
import javax.swing.*;
public class Demo extends JFrame{
JPanel jp1,jp2,jp3;
JLabel jlb1,jlb2;
JButton jb1,jb2;
JTextField jtf1;
JPasswordField jpf1;
public static void main(String args[]){
new Demo();
}
public Demo(){
jp1=new JPanel();
jp2=new JPanel();
jp3=new JPanel(); jlb1=new JLabel("用户名");
jlb2=new JLabel("密码");
jb1=new JButton("登陆");
jb2=new JButton("取消"); jtf1=new JTextField(10);
jpf1=new JPasswordField(10); this.setLayout(new GridLayout(3,2)); jp1.add(jlb1);
jp1.add(jtf1); jp2.add(jlb2);
jp2.add(jpf1); jp3.add(jb1);
jp3.add(jb2); this.add(jp1);
this.add(jp2);
this.add(jp3); this.setSize(300,150);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setResizable(false);
}
}
这个程序可以运行,但是Eclipse显示有一个警告,Description Resource Path Location Type
The serializable class Demo does not declare a static final serialVersionUID field of type long Demo.java /C/src line 3 Java Problem
请问这是什么意思啊?谢谢!
import javax.swing.*;
public class Demo extends JFrame{
JPanel jp1,jp2,jp3;
JLabel jlb1,jlb2;
JButton jb1,jb2;
JTextField jtf1;
JPasswordField jpf1;
public static void main(String args[]){
new Demo();
}
public Demo(){
jp1=new JPanel();
jp2=new JPanel();
jp3=new JPanel(); jlb1=new JLabel("用户名");
jlb2=new JLabel("密码");
jb1=new JButton("登陆");
jb2=new JButton("取消"); jtf1=new JTextField(10);
jpf1=new JPasswordField(10); this.setLayout(new GridLayout(3,2)); jp1.add(jlb1);
jp1.add(jtf1); jp2.add(jlb2);
jp2.add(jpf1); jp3.add(jb1);
jp3.add(jb2); this.add(jp1);
this.add(jp2);
this.add(jp3); this.setSize(300,150);
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setVisible(true);
this.setResizable(false);
}
}
这个程序可以运行,但是Eclipse显示有一个警告,Description Resource Path Location Type
The serializable class Demo does not declare a static final serialVersionUID field of type long Demo.java /C/src line 3 Java Problem
请问这是什么意思啊?谢谢!
果没有定义serialVersionUID,Eclipse会提供这个
提示功能告诉你去定义
加不加都可,序列化定义 防止盗版