问答题 [说明] 以下程序实现了在applet里移动图形文件，仔细阅读代码和相关注释，将程序补充完整。 [代码6-1] import j ava. awt. *; import j ava.awt.event.*; import java.applet. Applet; public class AppCIU extends Applet implements MouseMotionListener, MouseListener { Image IMG onClick=over(this) title=放大; // 声明 Image 类类型的变量 IMG onClick=over(this) title=放大 int x=70,y=60,posX=70,posY=60,dx,dy; public void init ( ) { IMG onClick=over(this) title=放大=getImage ( getCodeBase ( ) ,"mouse.gif" ); //载入影像 addMouseListener ( this ); addMouseMotionListener ( this ); 　 } public void mousePressed ( MouseEvent e ) { dx=e.getX()-posX； //取得按下之点与基准点X方向的距离 dy=e.getY()-posY； //取得按下之点与基准点Y方向的距离 } public void mouseDragged ( MouseEvent e ) { {{U}} (1) {{/U}} {{U}} (2) {{/U}} if ( dx＞0 && dx＜120 && dy＞0 && dy＜60 ) //如果指针落在图形上方 { Graphics g=getGraphics ( ); {{U}} (3) {{/U}} } } public void paint ( Graphics g ) { {{U}} (4) {{/U}} {{U}} (5) {{/U}} {{U}} (6) {{/U}} } public void mouseMoved ( MouseEvent e ) {}; public void mouseReleased ( MouseEvent e ) {}; public void mouseEntered ( MouseEvent e ) {}; public void mouseExited ( MouseEvent e ) {}; public void mouseClicked ( MouseEvent e ) {}; }