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Throw Keyword





In Java, you may use throw keyword when you explicitly want to throw an exception. The keyword throw is followed by an object of the exception class that you want to throw. Using throw keyword, an exception can be explicitly thrown from within the two places in a Java program -





To throw an exception out of catch block, keyword throw is followed by object reference of the exception class that was caught by catch block. For example -

Throwing an exception using the existing object reference of the exception class, IOException.
catch(IOException io)
{
throw io;       // An existing exception class object referenced by "io"  of type "IOException",  is thrown.
}
In both the cases above, an object of exception class of type IOException is thrown, once out of try block and once out of catch block.

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