请完善程序(程序文件名：Java_2.java)并进行调试。请在下画线处填入正确内容，然后删除下画线。请勿删除注释行和其他已有的语句内容。
题目要求：
显示一个窗口，并且在点击窗口右上方的“关闭窗口”按钮时，可以将窗口关闭。
程序运行显示窗口如下图所示。
源程序：
import java.awt.*;
import java.awt.event.WindowEvent;
import java.awt.event.WindowListener;
public class Java_2 extends (1) implements WindowListener
public static void main(String args[])
Java_2 fr=new Java_2();
fr. (2) (200, 100);
fr.setBackground(Color.green);
(3)
fr.setVisible(true);
public void windowClosing( (4) e)
System.exit(0);
public void windowClosed(WindowEvent e)
public void windowOpened(WindowEvent e)
public void windowlconified(WindowEvent e)
public void windowDeiconified(WindowEvent e)
public void windowActivated(WindowEvent e)
public void windowDeactivated(WindowEvent e)
