Core Java - Interview Questions and Answers for 'Throw' | Search Interview Question

Core Java - Interview Questions and Answers for 'Throw' - 6 question(s) found - Order By Newest

Q1. What things should be kept in mind while creating your own exceptions in Java?

Ans. All exceptions must be a child of Throwable.

If you want to write a checked exception that is automatically enforced by the Handle or Declare Rule, you need to extend the Exception class.

You want to write a runtime exception, you need to extend the RuntimeException class.

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Q2. Explain throw, throws , try and catch in Java ?

Core Java

Ans. throw is used to re throw an exception.throws is used to declare that the method throws the respective exceptions.try block is used to identify if the respective block has thrown any exception.catch is used to catch the exception that has been thrown by the respective try block.

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Q3. What is exception propogation ?

Core Java

Ans. Passing the exception object to the calling method.

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Q4. Difference between throw and throws ?

Core Java

Ans. throw is used to explicitly throw an exception especially custom exceptions, whereas throws is used to declare that the method can throw an exception.

We cannot throw multiple exceptions using throw statement but we can declare that a method can throw multiple exceptions using throws and comma separator.

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Q5. What is the purpose of re throwing the exception when we can provide the handling at the first catch itself ?

Core Java

Ans. Sometimes the calls move across layers of classes and functions and hence each layer needs to perform some function like cleaning if something goes wrong deep inside.

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Q6. What is Throwable ?

Core Java

Ans. Throwable in java is a class that is the superclass of all exceptions and errors which may occurs in java program.It extends obcect class.

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Q7. In Case a method is declared to throw an exception , We can only use a call to that method if ...

Core Java

a. We use the call within try block and catch the exception

b. We declare that the method is expected to throw the exception using throws

c. Both 1 and 2

d. Either 1 or 2

Ans.d. Either 1 or 2

Q8. Which of the following is true ?

Core Java

a. throw and throws are used to throw an exception

b. throw is used to throw an exception whereas throws is a declaration that the method can throw the exception

c. throws is used to throw an exception whereas throw is a declaration that the method can throw the exception

d. throw and throws are used to declare that an exception can be thrown by the method

Ans.b. throw is used to throw an exception whereas throws is a declaration that the method can throw the exception

Q9. throws is a declaration that the ..... is expected to throw an exception ?

Core Java

a. Variable

b. Method

c. Class

d. Interface

Ans.b. Method

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