Program to Move zeros to end of integer array in java (example)
Given an array containing integers (+ve, -ve & 0), we would like to move zeros to end of array. We […]
Interview Question
Find second smallest element in an array of integers (java / example)
Given an array of integers in java. Print second smallest element in an array (in single iteration). We have already discussed
Difference b/w length & capacity method (impact of trim) of StringBuffer in java
StringBuffer is a thread-safe, mutable sequence of characters. StringBuffer can be modified at any point of time. We will look
Difference between == operator & equals method in java (example)
Difference between equality operator & equals method in java. == operator is used to compare primitives & equals method is used to compare objects (example)
Implement two stacks using single array in java (example)
Given an array of integers in java. Create two stacks using single array. We shall able to perform push &
Find second largest element in an array of integers (java / example)
Given an array of integers in java. Print second largest element in an array (in single iteration). Example – find second largest
Create or implement stack using array in java (with example)
Create or implement stack in java using array as underlying data structure. We will create stack class having following methods
Find missing number or element from duplicated array in java
Given two arrays, one array is almost duplicate array of another array. Arrays are duplicated except one element. e.g. array1[] =
Find maximum sum subarray in java using Kadane’s algorithm
Given an array containing positive & negative integers. We would like to find subarray having maximum sum. We will use
Reverse an integer array in java using iterative & recursive algorithm
Given an integer array in java. Reverse input array using iterative & recursive algorithm. Example to reverse an integer array
Prime number generator in java using Sieve of Eratosthenes algorithm
A prime number is a natural number greater than 1 that has no positive divisors other than 1 & itself. e.g.Number 7
Find union of two sorted integer or number arrays in java (example)
Given two sorted integer arrays containing unique or distinct elements. We would like to find out the union of two
Find intersection/common elements of two sorted integer arrays in java (example)
Given two sorted arrays containing distinct elements. We would like to find out the intersection of two sorted arrays. Intersection
Replace every element in integer array by greatest number on its right (java/ example)
Given an array of integers in java. Replace every element of array with greatest number on its right. The right
Find leader elements/numbers in integer array (java/example/iterative algorithm)
Given an integer array in java, find out the leader elements in an array. What is leader element in an
Majority element in integer array (Boyer Moore’s voting algorithm) in java
Given an integer array in java, find the majority (element exist more than half element) element in an array using Boyer Moore’s voting algorithm.
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
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
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
Five pirates having 100 gold coins in a ship – puzzle (Logical question)
Logical Question/ Puzzle: Five pirates & 100 gold coins in a ship Five pirates say P1 to P5 (youngest to
Farmer, fox, goose & bean bag (river crossing puzzle/ logical problem)
1. Problem Statement or Puzzle: Farmer standing on the bank of river and want to cross the river. Boat has
Find min races required: 25 horses, 5 tracks, 3 fastest horses puzzle
25 horses, 5 tracks & 3 fastest horses puzzle Given 25 horses and a racing track. 5 horses can run simultaneously
Four person crossing collapsing bridge & Torch puzzle
Four person crossing collapsing bridge & torch puzzle: Four persons wants to cross a bridge at night. There is one
Find a box of defective balls puzzle (Logical Interview question)
Question: box of defective balls puzzle or logical interview question You are given 10 boxes containing balls. The 9 boxes
Three Ants on Equilateral Triangle Puzzle
Ants on equilateral triangle puzzle: Three ants are sitting on the corners of equilateral triangle. Ants can pick any direction
Calculate lose: lady, shopKeeper & fake note puzzle
Lady, shopKeeper & 1000$ fake note puzzle Shopkeeper A is selling the goods at no profit no loss (zero profit).
Gold bar & seven working days payment (logical interview question/puzzle)
GoldBar work payment logical interview question or puzzle: Given a gold bar that will be used to make a payment to a worker for seven days.
Single responsibility design principle – Java & C++ (SOLID & example)
What is Single Responsibility Principle? Single Responsibility Principle is one of the five principles of SOLID acronym. Single Responsibility Principle
Interface segregation design principle in java (SOLID & real time example)
Interface segregation principle (ISP) is one of the five principles of SOLID acronym. Interface Segregation Principle states “Clients should not