窗口中显示字符串“java程序设计”，按下键盘上的箭头键，可按照箭头方向移动（提示：得到键盘键代码的方法是e.getKeyCode()，上、下、左、右键的编码分别用常量VK_UP 、VK_DOWN 、VK_LEFT 、VK_RIGHT ...
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