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Core Java - Interview Questions and Answers for 'Catch' - 9 question(s) found - Order By Newest

Very Frequently asked.
 Q1. 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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 Q2. How can we make sure that a code segment gets executed even in case of uncatched exceptions ?
Ans. By putting it within finally.

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   Like         Discuss         Correct / Improve     java   oops   exceptions   finally   uncatched exceptions      basic        frequent

 Q3. 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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Try 1 Question(s) Test

 Q4. Can we have try and catch blocks within finally ?Core Java
Ans. Yes, if we have a cleanup code that might throw an exception in the finally block, then we can have a try-catch block

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 Q5. 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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 Q6. Can finally block be used without catch ?Core Java
Ans. Yes but should follow "try" block then.

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Try 1 Question(s) Test

 Q7. 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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 Q8. Which of the following is not possible ?

a. try block followed by catch
b. try block followed by finally
c. try block followed by catch block and then finally
d. try block without catch or finally block
Ans. try block without catch or finally block

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Try 1 Question(s) Test

 Q9. 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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   Like         Discuss         Correct / Improve     exception handling  try catch     Asked in 1 Companies

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