Java Interview Questions and Answers for Beginners - 2

Question: 6

What classes of exceptions may be throw statement?

A throw statement may throw any expression that may be assigned to the Throwable type.

Question: 7

What is the relationship between a method’s throw clause and the exceptions that can be thrown during the method’s execution?

A method’s throws clause must declare any checked exceptions that are not caught within the body of the method.

Question: 8

What is difference between throw and throws?

Question: 9

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

While creating your own exception.

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 Run time Exception class.

Question: 10

When assertion should be avoided?

In following situations the assertions should be avoided.

When assertion becomes a performance issue. It means an assertion should not include too complex logic equaling implementation of a method.

Do not use assertions in argument checking of public methods. As argument checking is part of a method implementation and if these arguments are erroneous then it will throw runtime exception and assertion failure will not result in any error.