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Core Java - Interview Questions and Answers for 'Exception handling' - 33 question(s) found - Order By Newest

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 Q1. What things should be kept in mind while creating your own exceptions in Java?Core 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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Frequently asked at HCL Technologies ( Based on 3 feedback )
  Q2. Difference between Checked and Unchecked exceptions ?Core Java
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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Very Frequently asked.
 Q3. 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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 Q4. Differences between class not found exception and noclassdef found error ?Core Java
Ans. ClassNotFoundException is an exception that occurs when we try to load a class at run time using Class.forName() or loadClass() methods and mentioned classes are not found in the classpath.

NoClassDefFoundError is an error that occurs when a particular class is present at compile time, but was missing at run time.

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 Q5. Is it necessary that each try block to be followed by catch block ? Core Java
Ans. It should be followed by either catch or finally block.

  Sample Code for Retry in case of exception

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 Q6. What is exception propogation ?Core Java
Ans. Passing the exception object to the calling method.

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 Q7. Can we have try and catch blocks within finally ?Core Java
Ans. Yes

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Frequently asked.
 Q8. When does the finally block gets executed ?Core Java
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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 Q9. When is the situation when finally section won't execute ?Core Java
Ans. If the process / app is abruptly killed or terminated.

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 Q10. How does a try statement determine which catch clause should be used to handle an exception?Core Java
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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 Q11. Give an Example of checked and unchecked exception ?Core Java
Ans. ClassNotFoundException is checked exception whereas NoClassDefFoundError is a unchecked exception.

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 Q12. Can finally block be used without catch ?Core Java
Ans. Yes but should follow "try" block then.

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 Q13. 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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 Q14. How finally used under Exception Handling?Core Java
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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 Q15. Will finally be called always if all code has been kept in try block ?Core Java
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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 Q16. 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
Ans. Compile Time Error: Unhandled exception type Exception

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 Q17. Can finally block throw an exception ?Core Java
Ans. Yes.

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 Q18. Tell me something about AssertionError ?Core Java
Ans. AssertionError is actually a fatal fault or a bug in the program. We may not like to continue program , request or thread execution if this error occurs as this condition is the assumption to continue further execution.

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 Q19. What are the fail safe systems ?Operating System
Ans. Fail Safe systems are tolerant systems that continue processing even if they sense any problem. the objective here is to continue with the processing even if there are some problems instead of completely shutting it down. Example could be to catch an exception and still letting it complete with partial results.

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 Q20. Can we have try statement without catch? If try statement contains return will the finally block be executed? What happens if there is an exception inside finally block?Core Java
Ans. Yes, with finally.

Yes, finally block will be executed even if there is no exception in try block.

If finally throws an exception, the exception gets thrown to the calling module.

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 Q21. What happens to the Exception object after the exception handling is done ?Core Java
Ans. As with all other objects its garbage collected after its usage unless its rethrown.

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 Q22. How can we catch an exception thrown by another thread ?Core Java
Ans. http://stackoverflow.com/a/6548203/2789764

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 Q23. Difference between Error and Exception ?Core Java
Ans. An Error indicates serious problems that a reasonable application should not try to catch whereas

An Exception indicates conditions that a reasonable application might want to catch.

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 Q24. What is the difference between following code segments

1.

try {
for(int i=0;i<100;i++){
calculate(i);
}
} catch (Exception ex) {
System.out.println("Error while processing")
}

and

2.

for(int i=0;i<100;i++){
try {
calculate(i);
} catch (Exception ex) {
System.out.println("Error while processing")
}
}
Core Java
Ans. In first case the whole loop will terminate as soon as any exception happens in the method calculate ( assuming calculate method is not handling its exception and those are thrown back at the calling method )

In Second case exception will be caught for individual iteration and hence it wont break the loop and will continue for the next iteration.

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  Q25. What is an exception and exception handling in Java ?Core Java
Ans. An Exception in java is the occurrence during computation that is anomalous and is not expected.

Exception handling is the mechanism which is used to handle such situations.


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 Q26. What are the different ways to handle an exception ?Core Java
Ans. 1. Wrap the desired code in try block followed by a catch / finally to catch the exception

2. Declare the throws clause with exceptions that the code is expected to throw as an indication to the calling method to take care of it.

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 Q27. How should we handle errors while writing or accessing Stored Procedures?Database
Ans. Store Procedure returns the error code. Moreover we can put the call withing try block and catch SQL Exception.

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 Q28. Can we have only try block in java ?Core Java
Ans. No, It should be followed by either catch or finally.

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 Q29. What is Exception Wrapping ?
Ans. Exception wrapping is wrapping an exception object within another exception object and then throwing the outer exception.

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 Q30. Can we catch errors in Java ? Core Java
Ans. Yes we can

try {
// code
} catch (Error ex) {
// handling code
}

but we shouldn't ideally do that as errors are mostly JVM based and not application based and there is rarely we can do something about it. Very likely catching and not re throwing would lead to muting their response or trace.

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