throws语句在java中意味着什么？ [英] What does throws statement mean in java?

问题描述

另外，会抛出NumberFormatException，IOException 是什么意思？我一直试图使用 BufferedReader 说：

Also, what does throws NumberFormatException, IOException mean? I keep trying to use BufferedReader by saying

BufferedReader nerd = new BufferedReader(new InputStreamReader(System.in));

但 BufferedReader 除非抛出NumberFormatException，IOException 被放入。

推荐答案

throws keyword表示某个方法可能会抛出某个异常。您需要使用 try-catch 块或添加<来处理可能的 IOException （以及可能的其他异常） code>向您的方法声明抛出IOException，（...）。这样的事情：

The throws keyword indicates that a certain method can potentially "throw" a certain exception. You need to handle a possible IOException (and possibly other exceptions) either with a try-catch block or by adding throws IOException, (...) to your method declaration. Something like this:

public void foo() throws IOException /* , AnotherException, ... */ {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    in.readLine();
    // etc.
    in.close();
}


public void foo() {
    BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    try {
        in.readLine();
        // etc.
        in.close();
    } catch (IOException e) {
        // handle the exception 
    } /* catch (AnotherException e1) {...} ... */
}

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