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difference between throw and throws in java?


throw is used to throw an exception object explicitly. It can take only one argument and that will be an exception object. Exception object to be thrown can be of either checked or unchecked exception type.


throw exception_object;



throws is used to throw an exception object implicitly. It is used with the method signature. More than one type of exception can be declared with method signature, they should be comma separated.

1.     throws is mainly used to throw checked exception.
2.     If you are calling a method that declares an exception, you must either caught or declare the exception.
3.     We can rethrow the exception.


methodName () throws comma separated list of exceptionClassNames{}


Difference between throw and throws.

                    throw keyword                     throws keyword
  1. Used to explicitly throw an exception.
  2. Only unchecked exception can propagate using throw.
  3. Used within the method.
  4. Cannot throw multiple exceptions.
  1. Used to implicitly throw an exception.
  2. Both checked and unchecked exception can propagate using throws.
  3. Used with the method signature.
  4. Can declare multiple exceptions.


Java interview questions on exception handling

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