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. What is the difference between throw and throws?

Question

. What is the difference between throw and throws?

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Solution

  1. Usage: "throw" is used to explicitly invoke an exception. It is used within the method body to throw an exception, and is followed by an instance. On the other hand, "throws" is used to declare an exception and it appears at the end of a method signature.

  2. Type of exceptions: "throw" is used to throw both checked and unchecked exceptions. "throws" is used to declare checked exceptions.

  3. Number of exceptions: With "throw" you can only throw one exception at a time. But with "throws", you can declare multiple exceptions, separated by a comma.

  4. Control flow: When an exception is thrown using "throw", the control immediately exits from the current method and goes back to the calling method. But in the case of "throws", the control goes to the next immediate catch block if one exists. If no catch block is found then the method ends abruptly and the control goes to the calling method.

  5. Keyword type: "throw" is an explicit keyword used to throw an exception to the runtime to handle it. "throws" is an implicit keyword used to specify the exceptions that are not handled by the method.

In summary, "throw" is used to actually throw an exception while "throws" is used to declare exceptions that might be thrown by the function.

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