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Interview Questions and Answers for 'Exception' - 81 question(s) found - Order By Newest

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 Q1. What are the ways to avoid LazyInitializationException ?Hibernate
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Ans. 1. Set lazy=false in the hibernate config file.

2. Set @Basic(fetch=FetchType.EAGER) at the mapping.

3. Make sure that we are accessing the dependent objects before closing the session.

4. Force initialization using Hibernate.initialize

5. Using Fetch Join in HQL.

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 Q2. What things should be kept in mind while creating your own exceptions in Java?Core Java
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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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 Q3. Explain java.lang.OutOfMemoryError ?Core Java
Anonymous
Ans. This Error is thrown when the Java Virtual Machine cannot allocate an object because it is out of memory, and no more memory could be made available by the garbage collector.

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 Q4. When do you get ClassCastException?

or

What is ClassCastException ?
Anonymous
Ans. As we only downcast class in the hierarchy, The ClassCastException is thrown to indicate that code has attempted to cast an object to a subclass of which it is not an instance.

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 Q5. How compiler handles the exceptions in overriding ?Core Java
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Ans. 1)The overriding methods can throw any runtime Exception , here in the case of runtime exception overriding method (subclass method) should not worry about exception being thrown by superclass method.

2)If superclass method does not throw any exception then while overriding, the subclass method can not throw any new checked exception but it can throw any runtime exception

3) Different exceptions in java follow some hierarchy tree(inheritance). In this case , if superclass method throws any checked exception , then while overriding the method in subclass we can not throw any new checked exception or any checked exception which are higher in hierarchy than the exception thrown in superclass method

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Very Frequently asked.
 Q6. Explain throw, throws , try and catch in Java ?Core Java
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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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 Q7. What will happen if we don't have termination statement in recursion ?
Manoj
Ans. Function call allocates a stackframe in stack. Every stackframe will use some memory to store local variables, parameters and to remember return address. Without terminating condition stackframes will keep consuming memory from stack and eventually program will result in stackoverflow error.

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 Q8. Name few Java Exceptions ?Core Java
Anonymous
Ans. IndexOutofBoundException ,
NoClassDefFoundException ,
OutOfMemoryException ,
IllegalArgumentException,
NullPointerException,
IllegalStateException

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 Q9. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
Anonymous
Ans. By putting it within finally.

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 Q10. Is it necessary that each try block to be followed by catch block ? Core Java
Anonymous
Ans. It should be followed by either catch or finally block.

  Sample Code for Retry in case of exception

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 Q11. What is exception propogation ?Core Java
Anonymous
Ans. Passing the exception object to the calling method.

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 Q12. Can we have try and catch blocks within finally ?Core Java
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Ans. Yes

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 Q13. What is ConcurrentModificationException ?Core Java
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Ans. This is the exception that is thrown when we try to modify the non concurrent collection class while iterating through it.

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 Q14. Which of the following exception is thrown when we try to access element which is beyond the size ?

a. NullPointerException
b. ArrayIndexOutOfBoundException
c. ArithmeticException
d. ParseException
Anonymous
Ans. ArrayIndexOutOfBoundException

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 Q15. Checked exception needs to be ...

a. Caught
b. Method needs to declare that it throws these exception
c. Either A or B
d. Both A and B
Anonymous
Ans. Either A or B

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Frequently asked.
 Q16. When does the finally block gets executed ?Core Java2016-10-31 09:29:10

Ans. A finally block of code always executes, whether or not an exception has occurred.The only time finally won't be called is if you call System.exit() or if the JVM crashes first.

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 Q17. Is it ok to use optional everywhere just to get over nullpointerexception ?Core Java2017-05-23 08:16:28

Ans. Optional is to be used for arguments / atrributes which are indeed optional i.e the request should continue even if they aren't provided. It should not be used for mandatory attributes or arguments as we would like application to shout out ( with error message / exception trace ) to signify a problem.

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Frequently asked at HCL Technologies ( Based on 3 feedback )
  Q18. Difference between Checked and Unchecked exceptions ?Core Java
Anonymous
Ans. Checked exceptions are the exceptions for which compiler throws an errors if they are not checked whereas unchecked exceptions are caught during run time only and hence can't be checked.

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 Q19. How does a try statement determine which catch clause should be used to handle an exception?Core Java
Anonymous
Ans. When an exception is thrown within the body of a try statement, the catch clauses of the try statement are examined in the order in which they appear. The first catch clause that is capable of handling the exception is executed. The remaining catch clauses are ignored.

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 Q20. Give an Example of checked and unchecked exception ?Core Java
Anonymous
Ans. ClassNotFoundException is checked exception whereas NoClassDefFoundError is a unchecked exception.

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 Q21. Can finally block be used without catch ?Core Java
Anonymous
Ans. Yes but should follow "try" block then.

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 Q22. How would you go about debugging a NullPointerException?Core Java
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Ans. Open ended Questions.

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 Q23. Difference between throw and throws ?Core Java
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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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 Q24. What are the sub classes of Exception class?Core Java
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Ans. The Exception class has two main subclasses : IOException class and RuntimeException Class.

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 Q25. How finally used under Exception Handling?Core Java
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Ans. The finally keyword is used to create a block of code that follows a try block. A finally block of code always executes, whether or not an exception has occurred.

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 Q26. Can try statements be nested?Core Java
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Ans. Yes

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 Q27. Will finally be called always if all code has been kept in try block ?Core Java
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Ans. The only time finally won't be called is if you call System.exit() or if the JVM crashes first.

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 Q28. what will be the output ?

class Animal {
public void eat() throws Exception {
}
}

class Dog2 extends Animal {
public void eat(){}
public static void main(){
Animal an = new Dog2();
an.eat();
}
}
Core Java
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Ans. Compile Time Error: Unhandled exception type Exception

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 Q29. Can finally block throw an exception ?Core Java
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Ans. Yes.

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 Q30. Which exception should be handled in the following code ?

File file = new File("../file.txt");
FileWriter fileWriter = new FileWriter(file);
Core Java
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Ans. IOException

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