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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

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   Like         Discuss         Correct / Improve     java   collections   map   treemap   hashmap     Asked in 31 Companies      basic        frequent

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Related Questions

  Which of the following collections stores its elements in insertion Order ?

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap
  What is comparator interface used for ?
  Which of the following collection maintain its elements in Natural Sorted order ?
  Which are the sorted collections ?
  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. Explain static blocks in Java ?Core Java
Ans. A static initialization block is a normal block of code enclosed in braces, { }, and preceded by the static keyword. Here is an example:

static {
// whatever code is needed for initialization goes here

A class can have any number of static initialization blocks, and they can appear anywhere in the class body. The runtime system guarantees that static initialization blocks are called in the order that they appear in the source code.

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   Like         Discuss         Correct / Improve     java   oops   static   static block     Asked in 16 Companies      basic        frequent

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  How can we run a java program without making any object?
  Similarity and Difference between static block and static method ?
  How can we create objects if we make the constructor private ?
  Is it possible to compile and run a Java program without writing main( ) method?
  Will the static block be executed in the following code ? Why ?
  Will static block for Test Class execute in the following code ?
  Can we initialize member variables within static block ?
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 Can we create object in static block ?

  Q3. Write a Program to check if 2 strings are Anagrams ?Core Java2016-11-30 20:52:37

Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
System.out.println("Strings are Anagrams");
anagram = false;

if(anagram == true){
System.out.println("Strings are not Anagrams");

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   Like         Discuss         Correct / Improve      check if 2 strings are Anagrams     Asked in 30 Companies      basic        frequent

Related Questions

  Difference between == and .equals() ?
  Why is String immutable in Java ?
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What is the difference between String , StringBuilder and StringBuffer ?
  What are the difference between composition and inheritance in Java?
  Does garbage collection guarantee that a program will not run out of memory?
  What are different ways to create String Object? Explain.
  Why Char array is preferred over String for storing password?
  Why do we need Inner classes ? Cant we just work with outer classes wherever we implement Inner classes ?
 What is the difference between declaration, instantiation and initialization ?
 Explain OOPs


Explain OOPs Principles


Explain OOPs Concepts


Explain OOPs features


Tell me something about OOPs

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