For example, some Collection implementations like List allow duplicate elements whereas other implementations like Set don't. A lot of the Collection implementations have a public clone method. However, it doesn't make sense to include it in all implementations of Collection. This is because Collect...
java.util.Collectionsis a utility class consists exclusively of static methods that operate on or return collections. It contains polymorphic algorithms that operate on collections, “wrappers”, which return a new collection backed by a specified collection, and a few other odds and ends.This class...
Core Interfaces - General Questions Collection Interface Why doesn't Collection extend Cloneable and Serializable? Why don't you provide an "apply" method in Collection to apply a given method ("upcall") to all the elements of the Collection?
I don't think it's a good idea to write toString method with arguments - doing so you will not override the default Object.toString and will have no benefits from using it outside your code. For example, when outputting elements of a collection which contain Person won't display neither ...
This isClassical Java Collection interview questionswhich I have also discussed in How HashMap works in Java. This collection interview questions is mostly asked during AVP Role interviews on Investment-Banks and has lot of followup questions based on response of interviewee e.g. Why HashMap keys...
4. Solve Questions Just like solving puzzles in a game, coding problems are like puzzles too. Practice solving them to show how smart you are Conclusion: In conclusion, this JAVA Interview Questions and Answers page serves as a valuable resource for both aspiring and experienced Java developer...
135 . What are the important interfaces in the collection hierarchy? 136 . What are the important methods that are declared in the collection interface? 137 . Can you explain briefly about the List interface? 138 . Explain about ArrayList with an example? 139 . Can an ArrayList have duplicate...
Java Collection Class Java Array Class Online Java Compiler Our Java programming tutorial provides various examples to explain the concepts. To compile and execute the given Java programming examples in your browser itself, we have providedOnline Java Compiler. You can edit and run almost all the ...
Prepare for your Java interviews with these essential Java interview questions and answers. Boost your confidence and ace your next job interview.
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