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请完成下列Java程序:记录鼠标在窗口中的信息,包括鼠标的移动事件以及鼠标在窗口中的位置坐标,要求在窗口下方显示鼠标的事件和位置信息,在窗口上方有按钮控制程序的正常退出。 注意:请勿改动main()主方法和其他已有语句内容,仅在下划线处填入适当的语句。 源程序文件代码清单如下: import java.awt.*; import java.awt..*; public class ex12_2 extends Frame implements MouseMotionListener, ActionListener { private Label 1; private String str=" "; public static void main(String args[]) { new ex12_2(); } ex12_2( ) { ______; setSize(200,200); Button btn=new Button("exit"); btn.addActionListener (this); add (btn, "North" ); l=new Label(str); add (l, "South" ); show (); } public void mouseMoved(Mouse ) { str="Move: "+ l. setText (str); } public void mouseDragged(Mouse ) { } public void actionPerformed(Action ) { if(.getActionCommand().equals("exit")) { System.exit(0); } } }
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