JAVA-通过字节流复制文件

public static void Copy(String oldFile,String newFile){
    try(FileOutputStream file1 = new FileOutputStream(newFile);
        FileInputStream file2 = new FileInputStream((oldFile))) {

        StringBuilder sb = new StringBuilder();
        byte[] data = new byte[1024];
        while ((file2.read(data))!=-1){
            file1.write(data);
        }

    } catch (FileNotFoundException e) {
        throw new RuntimeException(e);
    } catch (IOException e) {
        throw new RuntimeException(e);
    }
}