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| Core Java - Interview Questions and Answers for 'Utility classe' - 3 question(s) found - Order By Rating | ||||
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| Ans. Yes, With Java 8 we can use Interfaces as collection of utility methods through the use of default methods. | ||||
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 Discuss Correct / Improve  java 8 interfaces utility class utility classes | ||||
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| 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 ? | ||||
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| Ans. It will throw the ParseException as the date format doesn't abide with the format of the specified date. | ||||
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| Discuss Correct / Improve date utility classes dateformat exception parseexception | ||||
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| 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 ? | ||||
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| Ans. It could be worthy to move a method to util class if the method needs to be shared, doesn't require polymorphic behavior and need not be overridden in special cases. Don't belong to one group through is-a relationship ( You can share through parent class method ) Don't implement a specific interface ( java 8 default methods ) Doesn't involve complex computing as you will be loosing the benefit of object state with just static method. Doesn't require polymorphic behavior as static methods don't participate in runtime polymorphism. | ||||
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Discuss Correct / Improve utility classes util classes static methods application design  rare | ||||
| Related Questions | ||||
| Name few Java util classes that were introduced with Java 7 ? | ||||
| Name few Java Util classes introduced with Java 8 ? | ||||
| What are Util Classes ? What are its advantages ? | ||||
