java - Java “try without catch”和 “catch without tr

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我正在编写Java文件，但是当我尝试对其进行编译时，我不断收到3条错误消息:

reader.java:35:错误:不带“捕获”，“最终”或资源声明的“尝试”
尝试

reader.java:48:错误:“捕获”而没有“尝试”
catch(IOException e)

reader.java:52:错误:“捕获”而不是“尝试”
catch(异常e)

3个错误

为什么？我想念什么？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());
    }
}

最佳答案

您不能将reader.close()放在try和catch之间。可以将其放在 finally block中，也可以使用 try-with-resources 。喜欢，

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());
}

或使用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();
    }
}

关于java - Java “try without catch”和 “catch without try” ，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43441060/