I tried to demonstrate how to remove element from List in Java. There might be possibility to asked this question by interviewer in different way in your interview. How to remove any element from List, or its implementation class ArrayList, Vector, LinkedList or CopyOnArrayList. In a day-to-day development, you can found the situation where you have to remove item from List , based on the matching of value. So, you can use the following way in your real life project. If you don’t know how to iterate element from list in java, first visit provided link to understand how to iterate over ArrayList.

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How to print array either int or string or any another type is straight forward by using Arrays java utility class.
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There are different way of traversal of ListArrayList, Vector object in java for getting its values. In day-to-day life, we almost use List with different flavor of created object like AraryList, Vector, LinkedList on every alternate day in java programming language, but way of iteration is different , its depend upon the requirement and the required thing in mind on that point of time.

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Well, sometimes interviewer asked you , how to remove any Entry/record from Map, or its implementation class HashMap, Hashtable, LinkedHashMap or ConcurrentHashMap. In day-to-day development you can found the situation where you have to remove from Map best on the matching of key or value. So you can use the following way in your real life project. I prefer , if you don’t know how to iterate HashMap in java , first go through prior post to understand how to iterate over HashMap.
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There are different way of traversal of Map HashMap , ConcurrentHashMap object in java for getting key/value pair . In day-to-day life, we almost use Map (either get or put operation) on every alternate day in java programming language. But way of iteration is different , its depend upon the requirement and thing in mind on that point of time. Most of the time while iteration we don’t know the key and its value. we have to iterate over and best on that we usually process.
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HashMap and HashSet is one of the most frequently asked interview question during any level of core java interview. Usually, Collection framework and multi-threading interview questions are mostly on demand for core java interview question.

Both HshMap and HashSet are integral part of Collection framework in java. These are most frequently used collection classes, it means , HashMap from Map , HashSet from Set and ArrayList from List in java.
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It’s very important to understand the fundamental of both the interface for interview point of view or for work assignment aspect. Where should you use which interface? you can say most of the time you get encountered this question in interview which one should be used where?
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When I first encounter with these terminology, some questions arise in my mind about fail-fast and fail-safe , in initial days. When we add anything while iterating we encounter ConcurrentModificationException, specially , when we delete element from collection while iterating using for-each loop of jdk 5. I hope every developer in their life must encounter ConcurrentModificationException. The concept of fail-safe terminology in java iterator is new. First introduced with Concurrent Collections in Java 5 e.g. ConcurrentHashMap and CopyOnWriteArrayList.
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