我正在尝试关闭finally块中的scanner和printstream，它们在try块中声明。问题是，如果try块由于异常而失败，那么scanner和printstream永远不会被声明，导致finally块出错，我想在finally块中关闭它们。代码如下：

try {
            File readFile = new File(readFileName);
            File writeFile = new File(writeFileName);
            Scanner fileScanner = new Scanner(readFile);
            PrintStream output = new PrintStream(new FileOutputStream(writeFile,false)); // overwrite
            while(fileScanner.hasNextLine()) {
                output.println(fileScanner.nextLine());
                if (!fileScanner.hasNextLine()) {
                    break;
                }
                output.println();
            }
        }

        catch (FileNotFoundException fnfe) {
            System.out.println(fnfe.getMessage());
            System.exit(0);
        }

        finally {
            fileScanner.close();
            output.close();
        }

编辑：谢谢你的回答，我不用try with resources就解决了这个问题，在try块之前声明scanner和printstream，然后在try块中初始化它们，如下所示：

Scanner fileScanner = null;
PrintStream output = null;
        try {
            fileScanner = new Scanner(readFile);
            output = new PrintStream(new FileOutputStream(writeFile,false));
            ...
        }