Core java - Interview Questions and Answers for 'Datametica' | Search Interview Question

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 ?

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 java collections map treemap hashmap treemap vs hashmap Asked in 31 Companies basic frequent}

Try 1 Question(s) Test

Related Questions

What is comparator interface used for ?

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

a. HashMap
b. TreeMap
c. LinkedHashMap
d. LinkedMap

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. 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.

Help us improve. Please let us know the company, where you were asked this question :

_{Like Discuss Correct / Improve java oops static static block 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 ?

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 ?

How can we execute a Java class independently if it doesn't have a static main method ?

Can we create object in static block ?

Q3. Write a Program to check if 2 strings are Anagrams ?

Core Java

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

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

Help us improve. Please let us know the company, where you were asked this question :

_{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 ?

Explain the scenerios to choose between String , StringBuilder and StringBuffer ?

or

What is the difference between String , StringBuilder and StringBuffer ?

What are the difference between composition and inheritance in Java?

What is a Lambda Expression ? What's its use ?

Does garbage collection guarantee that a program will not run out of memory?

Why Char array is preferred over String for storing password?

Explain OOPs

or

Explain OOPs Principles

or

Explain OOPs Concepts

or

Explain OOPs features

or

Tell me something about OOPs

What are different ways to create String Object? Explain.

What is the difference between Encapsulation and Abstraction?

Search Interview Questions

Help us and Others Improve. Please let us know the questions asked in any of your previous interview.