Question

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

   import java.awt.Image;
   import java.awt.Toolkit;
   import javax.swing.JFrame;


   public class Profile extends JFrame implements ActionListener, MouseLIstener{

       JLabel home = new JLabel("Home");
       JLabel pro = new JLabel("Profile");    

       JTextField search = new JTextField("");

       JButton update = new JButton("Update Info");
       ImageIcon log = new ImageIcon("mini.png");
       JLabel logo = new JLabel(log, JLabel.CENTER);

       ImageIcon ban = new ImageIcon("cover.jpg");
       JLabel bann = new JLabel(ban, JLabel.CENTER);
       ImageIcon ppic = new ImageIcon("Koala.jpg");
       JLabel profile = new JLabel(ppic, JLabel.CENTER);
       ImageIcon menu1 = new ImageIcon("fbMenu.png");
       JLabel menu = new JLabel(menu1, JLabel.CENTER);

       Container c;
       Connection con;
       Statement st;
       ResultSet rs;
       int ctr;

       public Profile() {

           Image icon = Toolkit.getDefaultToolkit().getImage("fb.png");
           setIconImage(icon);
           this.setTitle("Profile");
           this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
           this.setResizable(false);
           this.setLayout(null);
           this.setSize(600, 500);
           this.setLocationRelativeTo(null);


           c=this.getContentPane();
           c.setLayout(null);
           this.add(update);
           c.add(profile);
           c.add(logo);
           c.add(search);
           c.add(home);
           c.add(pro);
           c.add(menu);
           c.add(bann);
           profile.setBounds(20, 150, 150, 150);
           bann.setBounds(0, 0, 600, 200);
           menu.setBounds(0, 0, 600, 40);
           home.setBounds(360, 10, 35, 25);
           pro.setBounds(410, 10, 40, 25);
           update.setBounds(300, 160, 110, 35);
           search.setBounds(90, 10, 230, 25);
           logo.setBounds(60, 10, 25, 25);

           update.addActionListener(this); 

       }


       public void actionPerformed(ActionEvent e){
               Object o = e.getSource();
           if(o==update)
           {    
               Update j= new Update();              
               j.setVisible(traue);
               this.setVisible(false);
               j.setVisible(true);
           }

       }
        public static void main(String[] args) {
           Profile pr = new Profile();
           pr.setVisible(true);
       }

   }

Answer 1

从下面的代码：

public class Profile extends JFrame implements ActionListener, MouseLIstener{

您输入错误的MouseListener名称为 MouseLIstener 。

更改

 MouseLIstener

到

 MouseListener

然后在下面添加无实现方法，它将适用于您的程序。

    public void mouseClicked(MouseEvent e) {
        // TODO Auto-generated method stub

    }


    public void mouseEntered(MouseEvent e) {
        // TODO Auto-generated method stub

    }


    public void mouseExited(MouseEvent e) {
        // TODO Auto-generated method stub

    }


    public void mousePressed(MouseEvent e) {
        // TODO Auto-generated method stub

    }


    public void mouseReleased(MouseEvent e) {
        // TODO Auto-generated method stub

    }

当我放置MouseListener时，类变为Error

1 个答案: