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In Java 7, can we catch by grouping exceptions that are hierarchically related?

We can group only un-related exceptions together. It is illegal to group exceptions which has parent-child relationship. For example, it is illegal to write a multi-catch statement like this: 

try {
    ...
 
} catch (FileNotFoundException | IOException ex) {
    System.err.println("File not found.");
}

FileNotFoundException is a subclass of IOException so this grouping is invalid and the compiler reports a problem that "error: Alternatives in a multi-catch statement cannot be related by subclassing".

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