Java“尝试而不捕获”和“捕获而不尝试”

Question

我正在编写一个 Java 文件，但是当我尝试编译它时，我不断收到 3 条错误消息：

reader.java:35: 错误：'try' 没有 'catch'、'finally' 或资源声明 try

reader.java:48: 错误：'catch' 没有 'try' catch(IOException e)

reader.java:52: 错误: 'catch' 没有 'try' catch(Exception e)

3 错误

为什么？我错过了什么？这是我的代码：

public static void processRecords(String filenameIn, Person[] personArray)
{
    try 
    {
        FileReader fr = new FileReader(filenameIn);
        BufferedReader reader = new BufferedReader(fr);
        reader.readLine();

        for (int i = 0; i <personArray.length; i++)
        {
            String[] data = reader.readLine().split("/t");
            personArray[i] = new Person(Integer.parseInt(data[0]), data[1], data[2], Integer.parseInt(data[3]));
        }
    }
        reader.close();
    catch(IOException e)
    {
        System.out.println("ERROR: WRONG FILE " + e.toString());
    }
    catch(Exception e)
    {
        System.out.println("ERROR" + e.toString());
    }
}

Answer 1

不能放在和reader.close()之间。要么把它放在一个块中，要么使用. 喜欢，trycatchfinallytry-with-resources

try (BufferedReader reader = new BufferedReader(new FileReader(filenameIn))) {
    reader.readLine();
    for (int i = 0; i < personArray.length; i++) {
        String[] data = reader.readLine().split("/t"); // <-- should be \\t for tab.
        personArray[i] = new Person(Integer.parseInt(data[0]), data[1], 
                data[2], Integer.parseInt(data[3]));
    }
} catch (IOException e) {
    System.out.println("ERROR: WRONG FILE " + e.toString());
} catch (Exception e) {
    System.out.println("ERROR" + e.toString());
}

或与finally块，

BufferedReader reader = null;
try {
    reader = new BufferedReader(new FileReader(filenameIn));
    reader.readLine();
    for (int i = 0; i < personArray.length; i++) {
        String[] data = reader.readLine().split("\\t"); // <-- to split on tab.
        personArray[i] = new Person(Integer.parseInt(data[0]), 
                data[1], data[2], Integer.parseInt(data[3]));
    }
} catch (IOException e) {
    System.out.println("ERROR: WRONG FILE " + e.toString());
} catch (Exception e) {
    System.out.println("ERROR" + e.toString());
} finally {
    if (reader != null) {
        reader.close();
    }
}