Core java - Interview Questions and Answers for 'Datametica' - 3 question(s) found - Order By Newest Very frequently asked. Favorite question in Walk in Drive of many Indian service companies. Q1. Difference between TreeMap and HashMap ? Core Java
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 Related Questions What is comparator interface used for ? Which of the following collections stores its elements in insertion Order ? Which are the sorted collections ? Which of the following collection maintain its elements in Natural Sorted order ? How can we reverse the order in the TreeMap ? TreeMap orders the elements on which field ? How TreeMap orders the elements if the Key is a String ? Can we add heterogeneous elements into TreeMap ? Will it create any problem if We add elements with key as user defined object into the TreeMap ? Q2. Write a Program to check if 2 strings are Anagrams ? Core Java
Ans. public void checkIfAnagram(String str1,String str2){ Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 30 Companies basic frequent Related Questions Difference between == and .equals() ? Why is String immutable in Java ? Explain the scenerios to choose between String , StringBuilder and StringBuffer ? What are the difference between composition and inheritance in Java? Explain OOPs What is a Lambda Expression ? What's its use ? Why Char array is preferred over String for storing password? What are different ways to create String Object? Explain. Does garbage collection guarantee that a program will not run out of memory? What is the difference between final, finally and finalize() ? Ans. A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example: Help us improve. Please let us know the company, where you were asked this question : Like Discuss Correct / Improve Asked in 16 Companies basic frequent Related Questions How can we run a java program without making any object? How can we create objects if we make the constructor private ? Similarity and Difference between static block and static method ? Will the static block be executed in the following code ? Why ? Is it possible to compile and run a Java program without writing main( ) method? Will static block for Test Class execute in the following code ? Can we initialize member variables within static block ? How can we execute a Java class independently if it doesn't have a static main method ? Can we create object in static block ?
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java collections map treemap hashmap treemap vs hashmap 
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Which of the following collections stores its elements in natural sorting order ?
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