用JAVA编程完成一下文件的建立和复制？

//自己选择复制的文件和选择复制的路径

import java.awt.Container;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.*;
import javax.swing.*;

public class 选择复制 extends JFrame {
JTextField lujin, key;

JButton Lu, Key, fuzhi;

public 选择复制() {
Container c = getContentPane();
c.setLayout(new FlowLayout());
lujin = new JTextField(20);
Lu = new JButton("选择路径");
c.add(lujin);
c.add(Lu);
key = new JTextField(20);
Key = new JButton("存储路径");
c.add(key);
c.add(Key);
fuzhi = new JButton("确定复制");
c.add(fuzhi);
Lu.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent event) {
JFileChooser fileChooser = new JFileChooser(); // 实例化文件选择器
fileChooser
.setFileSelectionMode(JFileChooser.FILES_AND_DIR