[主观题] 【程序分析题】阅读下列程序，请写出该程序的功能。
import java.util.*; import java.io.*;
import java.awt.*;import javax.swing.*;import java.awt.event. *;
class MyFrame extends JFrame implements ActionListener {
JText Area text;
JTextField tf; Buffered Writer out;
MyFrame () {
super("—个测试程序")；
Container con = getContentPane();
text = new JTextArea(10, 20);
text.setBackground(Color.cya^);
tf = new JTextField();
tf.addActionListener(this);
con.setLayout(new BorderLayout())
con.add(text, ’’Center"); con.add(tf, "South");
setVisible(true); pack();
}
public void actionPerformed(ActionEvent e)
{ if (e.getSource() == tf) {
try {
out = new BufferedWriter(new FileWriter(tf.getText()));
StringTokenizer tokens=new StringTokenizer(text.getText（）);
int n = tokens.countTokens(), i;
for(i = 0; i < n; i++){
out. write(tokens.nextT oken()+”\r\n");
out.flush(); text.setText(null); System.exit(O);
} catch (IOException exp) {
text.setText("文件写出错！ \n");
}
}
}
ptr c class Test36{
public static void main(String args[])
{ new MyFrameQ;

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