保存在另一个目录JAVA - 非常简单的问题!

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;

public class FileCopy {
    public static void main(String[] args) {
        File sourceFile = new File("source.txt");
        File targetFile = new File("target.txt");

        try {
            FileInputStream fis = new FileInputStream(sourceFile);
            FileOutputStream fos = new FileOutputStream(targetFile);

            byte[] buffer = new byte[1024];
            int length;

            while ((length = fis.read(buffer)) > 0) {
                fos.write(buffer, 0, length);
            }

            fis.close();
            fos.close();

            System.out.println("File copied successfully!");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }
}