Java Program to Print Numbers from 1 to 100 without using Loop

Write a java program to print numbers from 1 to 100 without using loop.  This is a very interesting and tricky problem for beginners. You have to think how to solve this problem without using loop.

This problem can be easily solved using loop, (for and while loop).  So, how do you solve this problem without using loop? The answer is using recursion.

So, In this tutorial, we are going to solve this problem using recursion.

Bubble Sort Program in Java

In this article, we are going to implement bubble sort program in java. Bubble sort is a simple sorting algorithm which is used to sort an unsorted array.

We are going to cover following points in this tutorial.

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i) What is Bubble Sort Algorithm?
ii) Bubble sort implementation in java (We sort an unsorted array using bubble sort algorithm).
iii) Bubble sort video tutorial.

Find First Non-repeated Character in a String – Java Code

Write a java program to find first non-repeated character in a string. Given an input string, find it’s first non-repeated character in a string.

For example –

i) Input string – java
Output – j (j is the first non-repeating character in a string)

ii) Input string – web rewrite
Output – b (b is the first non-repeating character in a string)

Anagram Program in Java : Check whether Two Strings are Anagrams of each other

Write a anagram program in java or Java program to check anagram. In this programming question, we are going to write a java code to check whether two strings are anagrams of each other.

Let’s first understand what is an anagram? and how we are going to solve this problem.

What is an Anagram?

Two strings are said to be anagrams of each other if it contains the same characters, only the order of characters in both the strings is different. In other words, both strings must contain the same exact letters in the same exact frequency.

Check Prime Number in Java

How to check prime number in Java. In this tutorial, we are going to write a Java program to check whether a number is prime or not. Also In this tutorial, we’ll discuss multiple approaches and their time complexity to solve this problem.

Before writing a program, let’s quickly understand what is a prime number.

What is Prime Number?

A prime number is a number that is greater than 1 and it has no positive divisors other than 1 and itself.

For example – 3, 13, 7  is a prime number, as it’s divisible by 1 and itself. Similarly, 29, 19 etc. are also prime numbers.

6 is not a prime number as it’s divisible by 1, 2, 3 and 6.

 2 is the only even prime number.

 

How to Check whether a Number is Prime or not in Java

Find Duplicate Elements in an Array – Java Program

Write a java program to find duplicate elements in an array. There are multiple ways through which we can find duplicate elements in an array. In this tutorial, I’ll discuss three ways to find duplicate elements in an array.
This question is also very important in terms of technical interviews.