Java多重捕获异常错误

Question

import java.io.*;
import java.util.*;

public class MultiCatch
{
    public static void main(String[] args)
    {
        int number;

        try
        {
            File file = new File("Numbers.txt");
            Scanner inputFile = new Scanner(file);

            while (inputFile.hasNext())
            {
                number = inputFile.nextInt();

                System.out.println(number);
            }

            inputFile.close();
        }

        catch(FileNotFoundException | InputMismatchException ex)
        {
            System.out.println("Error processing the file.");
            //System.out.println("Error processing the file." + ex.getMessage());
        }
    }
}

$ javac MultiCatch.java
MultiCatch.java:25: <identifier> expected
        catch(FileNotFoundException | InputMismatchException ex)
                                   ^
MultiCatch.java:25: '{' expected
        catch(FileNotFoundException | InputMismatchException ex)
                                     ^
MultiCatch.java:25: not a statement
        catch(FileNotFoundException | InputMismatchException ex)
                                                             ^
MultiCatch.java:25: ';' expected
        catch(FileNotFoundException | InputMismatchException ex)
                                                              ^
MultiCatch.java:31: reached end of file while parsing
}
 ^
5 errors

如果这有什么不同的话，我是在运行Java7的OSX10.8上。

Answer 1

在Java6下，我在您的代码中得到以下编译器错误：

C:\dev\src\misc\MultiCatch.java:25: <identifier> expected
        catch(FileNotFoundException | InputMismatchException ex)
                                   ^
C:\dev\src\misc\MultiCatch.java:25: '{' expected
        catch(FileNotFoundException | InputMismatchException ex)
                                     ^
C:\dev\src\misc\MultiCatch.java:25: not a statement
        catch(FileNotFoundException | InputMismatchException ex)
                                                             ^
C:\dev\src\misc\MultiCatch.java:25: ';' expected
        catch(FileNotFoundException | InputMismatchException ex)
                                                               ^
C:\dev\src\misc\MultiCatch.java:31: reached end of file while parsing
}

但是，在Java7下，代码可以成功编译。

您必须使用Java6或更低版本才能得到这些错误。

catch(FileNotFoundException | InputMismatchException ex)