MouseListener
import java.awt.*;import java.awt.event.*;
import java.awt.event.MouseListener;
import java.util.EventListener;
import java.awt.event.MouseMotionListener;
public class DrawLineApp extends Frame implements MouseListener,MouseMotionListener{
public static void main(String args[]){
new DrawLineApp();
}
}
程序运行的结果，提示：
E:\Java\JCreator Pro\MyProjects\DrawLineApp\DrawLineApp.java:6: DrawLineApp 不是抽象的 ，并且未覆盖 java.awt.event.MouseListener中的抽象方法mouseExited(java.awt.event.MouseEvent)
public class DrawLineApp extends Frame implements MouseListener,MouseMotionListener{
为什么？
