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| Core java - Interview Questions and Answers for 'Jean martin' - 3 question(s) found - Order By Newest | ||||
 Very Frequently asked. Have been asked in HCL Technologies very frequently ( based on 3 feedback ). Among first few questions in many interviews. | ||||
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| Ans. Abstract classes can have both abstract methods ( method declarations ) as well as concrete methods ( inherited to the derived classes ) whereas Interfaces can only have abstract methods ( method declarations ). A class can extend single abstract class whereas it can implement multiple interfaces. | ||||
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 Discuss Correct / Improve  java classes abstract class interfaces abstract class vs interface abstract classes vs interfaces  Asked in 82 Companies  basic  frequent | ||||
 Related Questions | ||||
 What are the different uses of Interfaces in Java ? | ||||
| Why can't we have diamond problem with interfaces ? | ||||
| Why do we need Thread class even in case we execute thread using runnable interface ? | ||||
| What is the difference between List, Set and Map ? or What are the different Java Collections Interfaces ? | ||||
| What are Marker Interfaces ? Name few Java marker interfaces ? | ||||
| Can we declare interface methods as private ? | ||||
| What is comparator interface used for ? | ||||
| What is the use of runnable interface if we can always create a new thread using Thread class ? | ||||
| Which of the following doesn't extend Collection interface ? | ||||
| Frequently asked at HCL Technologies ( Based on 3 feedback ) | ||||
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| 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. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve java exceptions checked exceptions unchecked exceptions exception handling checked vs unchecked exceptions Asked in 39 Companies basic frequent | ||||
 Try 1 Question(s) Test | ||||
| Related Questions | ||||
| Checked exception needs to be ... | ||||
| Give an Example of checked and unchecked exception ? | ||||
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| 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. | ||||
| Help us improve. Please let us know the company, where you were asked this question : | ||||
| Discuss Correct / Improve exception handling Asked in 18 Companies basic frequent | ||||
| Related Questions | ||||
| What are the ways to avoid LazyInitializationException ? | ||||
| How compiler handles the exceptions in overriding ? | ||||
| What things should be kept in mind while creating your own exceptions in Java? | ||||
| Difference between Checked and Unchecked exceptions ? | ||||
| Explain java.lang.OutOfMemoryError ? | ||||
| When do you get ClassCastException? or What is ClassCastException ? | ||||
| If you are given a choice to implement the code to either Insert a Record or Update if already exist, Which approach will you follow ? | ||||
| Explain throw, throws , try and catch in Java ? | ||||
| What is ConcurrentModificationException ? | ||||
| What will happen if we don't have termination statement in recursion ? | ||||
