填空题

【说明】
以下程序实现了利用鼠标任意移动该圆形的位置，仔细阅读代码和相关注释，将程序补充完整。
【代码6】
import java.awt.*;
import java.awt.event.*;
public class CIUSAMPLE extends Frame implements MouseMotionListener, MouseListener
static CIUSAMPLE frm=new CIUSAMPLE ();
int x=70,y=60,posX=70,posY=60,dx,dy;
public static void main ( String args[])

frm.setTitle ("Dragging a circle");
frm.setSize ( 200,150 );
(1)
frm.addMouseMotionListener ( frm );
frm. setVisible ( true );

public void mousePressed ( MouseEvent e )

(2)
dy=e.getY () -posY;

public void mouseDragged ( MouseEvent e )

(3)
y=e.getY () -dy;
if ( dx＞0 && dx＜50 && dy＞0 && dy＜50 ) //如果指我落在正方形区域内

Graphics g=getGraphics ();
(4)


public void paint ( Graphics g )

g.setColor ( Color. pink ); // 设置绘图颜色为粉红
g.fillOval ( x,y,50,50 ); //以基准点为图形的左上角绘出圆形
(5)
posY=y;

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 )