释放java文件句柄

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

public class FileHandleExample {
    public static void main(String[] args) {
        FileInputStream inputStream = null;
        FileOutputStream outputStream = null;

        try {
            inputStream = new FileInputStream("input.txt");
            outputStream = new FileOutputStream("output.txt");

            // 进行文件操作
            byte[] buffer = new byte[1024];
            int bytesRead;
            while ((bytesRead = inputStream.read(buffer)) != -1) {
                outputStream.write(buffer, 0, bytesRead);
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            // 关闭文件句柄
            try {
                if (inputStream != null) {
                    inputStream.close();
                }
                if (outputStream != null) {
                    outputStream.close();
                }
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
}