Core Java - Interview Questions and Answers for 'Treemap' - 17 question(s) found - Order By Rating Q1. Difference between TreeMap and SortedMap ? Core Java 2019-02-06 11:26:07
This question is still unanswered. Can you please provide an answer. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q2. How to sort objects based on one of the field ? Core Java 2018-07-04 16:23:09
Ans. Using comparable and comparator and sorted collections like TreeSet or TreeMap. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies Basic frequent Q3. What is the difference between TreeSet and TreeMap ? Core Java 2018-06-27 09:56:39
Ans. TreeSet contains only values as elements whereas TreeMap contains Key value pairs. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 1 Companies rare Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Q4. Difference between TreeMap and HashMap ? Core Java Anonymous
Ans. They are different the way their elements are stored in memory. TreeMap stores the Keys in order whereas HashMap stores the key value pairs randomly. Sample Code for treemap Sample Code for hashmap Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 31 Companies basic frequent Q5. What is comparator interface used for ? Core Java Admin
Ans. The purpose of comparator interface is to compare objects of the same class to identify the sorting order. Sorted Collection Classes ( TreeSet, TreeMap ) have been designed such to look for this method to identify the sorting order, that is why class need to implement Comparator interface to qualify its objects to be part of Sorted Collections. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 2 Companies Intermediate Q6. Which are the sorted collections ? Core Java Admin
Ans. TreeSet and TreeMap Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve basic frequent Q7. How can we reverse the order in the TreeMap ? Admin
Ans. Using Collections.reverseOrder() tree = new TreeMap(Collections.reverseOrder()); Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q8. TreeMap orders the elements on which field ? Admin
Ans. Keys Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q9. How TreeMap orders the elements if the Key is a String ? Admin
Ans. As String implements Comparable, It refers to the String compareTo method to identify the order relationship among those elements. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q10. Can we add heterogeneous elements into TreeMap ? Admin
Ans. No, Sorted collections don't allow addition of heterogeneous elements as they are not comparable. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q11. Will it create any problem if We add elements with key as user defined object into the TreeMap ? Admin
Ans. It won't create any problem if the objects are comparable i.e we have that class implementing Comparable interface. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q12. Can we have null keys in TreeMap ? Core Java Admin
Ans. No, results in exception. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 6 Companies Basic frequent Q13. Can value be null in TreeMap ? Core Java Admin
Ans. Yes. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q14. Which interface TreeMap implements ? Admin
Ans. TreeMap implements NavigableMap, SortedMap, Serializable and Clonable. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q15. Which tree is used to implement TreeMap in Java? Admin
Ans. Red Black Tree Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve expert Q16. Which of the following collection maintain its elements in Natural Sorted order ? Anonymous
Ans. TreeMap Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Q17. If we add Enum constants to a sorted collection ( Treemap , TreeSet ), What will be the order in which they will be maintained ? Anonymous
Ans. Order in which constants are declared. Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve
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Which of the following collections stores its elements in natural sorting order ?
