Find LCM of two numbers using GCD in java (example)
LCM (Least common multiple) of two integers is the least positive integer that is divisible by both a and b. e.g […]
Reverse each word of a string using StringBuilder in java (example)
Given a string in java, reverse each word of string using StringBuilder in java. Let us look into couple of
Reverse string word by word in java (stack/ stringbuilder /example)
Given a string in java, reverse the string word by word. Let us look into couple of examples to understand
Find a missing number in an array of distinct integers in java (example)
Given an array containing n-1 distinct positive numbers range from 1 to n. e.g suppose n = 5, array will contain 4 unique
Find a number occurring odd number of times in integer array using java
Given an array of integer containing positive numbers. All number in an array is occurring even number of times except one
Swap two numbers in java using third or temporary variable (example)
Given two input numbers, swap numbers using temporary variable. e.g. Given two input numbers x = 10 & y =
Check whether given integer number is prime or not in java (example)
Given an integer, check whether input number is prime or not. A prime number is a natural number greater than 1
Program to convert binary number to decimal (java api, iterative & recursive)
Given a binary number, convert binary number to decimal number using java. We discuss various methods to convert binary number
GCD of two numbers Euclidean algorithm in java (iterative/ recursive)
The greatest common divisor (GCD) is the largest natural number that divides two numbers without leaving a remainder. e.g gcd ( 10,15) =
Check given number is palindrome using java (non-recursive/example)
What is palindrome ? A palindrome is a word, number, phrase, or other sequence of characters which reads the same from
Find area & perimeter of a square in java (with example)
What is Square shape ? The square is a fundamental shape in geometry, characterized by several defining properties. It is
Given radius, find area & circumference of circle in java (example)
Given radius of circle, find out the area & circumference of circle in java (with example). Area of circle is PI * radius * radius
Find area & perimeter of rectangle in java (with example)
Given a length and breadth of a rectangle, find the area and perimeter of rectangle. Area of rectangle is length * breadth e.g if
Find area of triangle using base & height in java (example)
Given base & height of triangle, calculate the area of triangle. Area of triangle = 0.5 * base * height. e.g
Find area of triangle (three sides) using hero formula ( java & example)
Given three sides of triangle, find the area of triangle using hero’s formula. Suppose a, b and c are the
Swap two numbers without using third or temporary variable in java
Program to swap two numbers / variable without temporary or third variable in java using XOR , addition / subtraction , multiplication / division methods
Program to check given input number is even or odd in java (example)
What are even & odd numbers ? Given a number in java, check whether number is even or odd The
Find factorial of number in java – recursive & iterative (example)
What is factorial of number? Factorial of a non-negative integer n, denoted by n!. Factorial is the product of all
Reverse number – Leet Code Challenge
Given a input number in java. Reverse input number using iterative or non recursive algorithm. e.g. if input number is
Generate/ print fibonacci series in java – recursive & iterative (example)
What is Fibonacci series? Fibonacci number is obtained by adding two preceding numbers. Fibonacci series is collection of fibonacci numbers. e.g. fibonacci
Java API, recursive & iterative algorithm to reverse string (example)
Given a String in java, reverse the String using standard java classes & recursive/iterative algorithm. e.g. reverse(“Lived”) = “deviL” reverse(“Star”) =
Create or implement FizzBuzz game program in java (with example)
What is Fizz buzz game? FizzBuzz game is very famous interview question. Fizz buzz is a group word game used
try with resources & AutoCloseable java 7 (example & class hierarchy)
The try-with-resources is try statement that used to declare one or more resources. e.g. resources like BufferedReader, Scanner, BufferedWriter can
Catch multiple exceptions before & after java 7 (examples)
What is exception (background)? Exception occurs in an application mostly due to programming mistakes. e.g. NullPointerException occurs, when we try
User defined custom Runtime/Unchecked exception example
What is user defined or custom exception in java? User defined exceptions is concrete class extending exceptions like Exception, RuntimeException
Open close design principle – SOLID & real time examples
What is Open close software design principle? Benjamin disraeli said ‘Change is inevitable, Change is constant’. Change is constant in
Create custom or user defined unchecked exception in java (example)
Create a user defined exception in java. Create a custom exception, by extending unchecked exceptions. We will create CustomArithmeticException by extending
Encrypt Decrypt message using AES-128 CBC in java (with example)
Given a message, We would like to encrypt & decrypt plain/cipher text using AES CBC algorithm in java. We will
TypeSafe config & HOCON + Read JSON properties in java (example)
Given a java application, We would like to read the property file defined in HOCON (Human-Optimized Config Object Notation.) or
Create runnable jar in java using apache shade plugin (maven/example)
What we will have in this post ? We will create a maven project and add apache shade plug-in. Create runnable