java - 公共(public)字符串 - 无法解析

Question

错误

bw.write(dataString);

我该如何解决这个问题？
dataString 无法解析为变量。

public class test {
        public static void main(String[] args){
            ArrayList<String> data = new ArrayList<String>();

            try (BufferedReader br = new BufferedReader(new FileReader("src/test.txt"))) {
            String CurrLine;

            while((CurrLine = br.readLine()) != null) {
                data.add(CurrLine);
            }
            String[] dataArray = new String[data.size()];
            String dataString = Arrays.toString(dataArray);

            String[] client = dataString.split("<::>");
            Integer nameId = Arrays.binarySearch(client, "Test");
            Integer versId = nameId + 1;
            System.out.println(client[nameId] + "\n" + client[versId]);


        } catch(FileNotFoundException ex) {
        System.out.println("FNFE");
        } catch(IOException ex) {
            System.out.println("IOE");
        }
            try{
                File file = new File("src/test.txt");
                if (!file.exists()) {
                file.createNewFile();
                }
                FileWriter fw = new FileWriter(file);
                BufferedWriter bw = new BufferedWriter(fw);
        bw.write(dataString);
                bw.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
    }

Answer 1

在 try 和 catch block 之外声明dataString...仅此而已。 ;) 如果您在循环内声明它，或者在本例中是您的 try catch block ，则其生命周期仅限于它。

像这样:

String dataString = null;

在 try-catch block 内:

dataString = Arrays.toString(dataArray);