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What is rethrowing an exception?

Exceptions that raised in the try block are handled in the catch block. If it is unable to handle that exception, it can re-throw that exception using throw keyword. It is called re-throwing an exception.

try
{
    String s = null;
    System.out.println(s.equals(“hello”));
   //This statement throws NullPointerException
}
catch (NullPointerException ex)
{
    System.out.println("NullPointerException is caught.");
 
    throw ex;     //Re-throwing NullPointerException
}

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