题目内容
（请给出正确答案）
[主观题]
单击向下方向键按钮，控制mc影片剪辑向下移动50像素。on（keyPress"_________"）{_root.mc.x-=50；}
如搜索结果不匹配，请 联系老师 获取答案
.jpg)
注意：请勿改动其他已有语句内容，仅在横线处填入适当语句。
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
public class Example2_8 extends Applet implements KeyListener
{
public void keyTyped(KeyEvent e) {}
public void keyReleased(KeyEvent e) {}
Button button;
Button stopButton;
Label out;
int x,y;
public void _______ ()
{
button = new Button("移动");
button.addActionListener(new AddMoveListener(this));
stopButton = new Button("停止移动");
stopButton.addActionListener(new RemoveListener(this));
stopButton.setEnabled(false);
out = new nabel("按下按钮以后我可以随方向键移动");
add(button);
add(stopButton);
add (out);
}
public void start()
{
super, start ();
}
public void keyPressed(KeyEvent e)
{
x=out.getBounds().x;
y=out.getBounds().y;
if(e.getKeyCode()==KeyEvent.VK_UP)
{
y=y-2;
if(y＜=0) y=0;
out. setLocation (x, y);
}
else if(e.getKeyCode()==KeyEvent.VK_DOWN)
{
y=y+2;
if (y＞=300) y=300;
out. setLocation (x, y);
}
else if(e.getKeyCode()==KeyEvent.VK_LEFT)
{
x=x-2;
if(x＜=0) x=0;
out. setLocation (x, y);
}
else if(e.getKeyCode()==KeyEvent.VK_RiGHT)
{
