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

public class test extends JFrame {
 JLabel la = new JLabel();
 test(){
  setTitle("No.1");
  setLayout(new FlowLayout());
  setSize(300,300);
  setVisible(true);
  setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  setContentPane(new Panel());
  la.addMouseListener(new ML());
  
 }
 class Panel extends JPanel{
  Panel(){
   setLayout(new FlowLayout());
   la=new JLabel("여기요");
   add(la);
  }
 }
 class ML extends MouseAdapter{
    public void mouseEntered(MouseEvent e){
     la.setText("사랑");
    }
    public void mouseExited(MouseEvent e){
     la.setText("Love");  
    }
    public void mouseDragged(MouseEvent e){
     setBackground(Color.BLUE);
    }
   }

 public static void main(String[] args) {
  new test();

 }

}

 

원본코드고요. 드래그가 아예 안먹히는듯합니다;

백그라운드말고 text글씨바꾸는것도 안되는데 이유가 뭘까요??

알려주세요.. 고맙습니다