Hello guys, if you are wondering how to calculate compound interest in Java or looking for Java program to calculate compound interest then you have come at the right place. Earlier I have shared how to calculate simple interest in Java and today I am going to share how to calculate compound interest in Java program. Calculating simple interest or compound interest are common coding problem which are taught in schools and colleges to teach you coding. The best thing about these coding exercise in Java are that everybody are familiar with them so you know the concept already and all you need to do is convert that solution into code which is the skill needed to become a coder or programmer.
How to check if a Number is Power of Two in Java? [Bitwise AND Example]
Hello guys, if you are thinking about how to check if a given number is a power of two without using an arithmetic operator like division then you have come to the right place. In Java, you can use bitwise operators like bitwise AND check if a given number if the power of two or if the given number is even or odd. In this Java Programming tutorial, you will learn how to check if the number is the Power of two using a bitwise operator. The main purpose of this program is to teach you how to use bit-wise operators like bitwise AND (&) in Java. A number is said to be the power of two if all its prime factors are 2, but in the binary world, things work a little differently.
[Solved] How to count Vowels and Consonants in Java String Word? Example
Hello guys, if you are wondering how to count number of vowels and consonants in a given word in Java then you have come to the right place. In the past, I have shared 100+ data structure questions and more than 75 programming interview questions, and In this article, we will take on a popular programming exercise of counting vowels in a word. You need to write a Java program to count how many vowels in a String, which is entered from the command prompt. It's similar to the program of counting the occurrence of characters in a String, in fact, it's a special case, where you need to count occurrences of all vowels, which includes five characters a, e, i, o and u.
[Solved] How to convert Hexadecimal to Decimal, Binary and Octal in Java? Example
Hexadecimal to decimal and binary conversion in Java
Hello guys, if you are wondering how to convert a Hexadecimal number to decimal and binary number in Java then you have come to the right place. Earlier, I have shown you how to convert decimal to binary in Java and in this Java program will convert Hexadecimal number to decimal, binary and Octal in Java programming language using JDK standard API methods. For beginners who are not familiar with number system, hexadecimal system is base 16 number, while decimal is base 10, Octal is base 8, and binary is base 2 numbers in Number systems.
How to create a Function to add two numbers in Java? Variable Argument Example Tutorial
How to add two numbers in Java
Hello guys, if you are just starting with Java programming and wondering how to write a function to add two numbers in Java then you have come to the right place. In this Java program tutorial, we will add two numbers provided by the user on the command line. Write a Java program to add two numbers in Java is a common programming exercise for programmers and mostly asked in college exams, school homework, and Java courses as well.
Hello guys, if you are just starting with Java programming and wondering how to write a function to add two numbers in Java then you have come to the right place. In this Java program tutorial, we will add two numbers provided by the user on the command line. Write a Java program to add two numbers in Java is a common programming exercise for programmers and mostly asked in college exams, school homework, and Java courses as well.
[Solved] How to solve climbing stairs problem in Java? Example
In this article, we are going to be solving the stairs problem using java, After that, I shall be explaining the concept of Array. but before we start writing codes it is fine to have an understanding of the problem we are about to solve. Given the number of stairs and the number of times you can move your legs, we would see how many possible ways you can achieve the climbing of stairs. The image below shows different possible ways you can climb stairs. For instance, let us say we have 5 steps on the stairs. and you can either walk with 2 moves or 1.
How to Search an Element in Java Array with Example? ArrayUtils Tutorial
find an index of the object in Array
While programming in Java, many times we need to check if a String array contains a particular String or an integer array contains a number or not. Though array is an object in Java but it does not provide any convenient method to perform searching elements or finding elements. Sometimes you even need an index of an item stored in Array, unfortunately, Java API does not provide any direct method. Thanks to Open Source Apache Commons provides a utility class called ArrayUtils which allows you to check for an Item in Array, find its index in the array, find its lastIndex in Array and perform several other common operations.
[Solved] How to solve a coin change problem in Java? Example
The coin change problem is one of the popular coding interview question and knowing how to solve this problem can help you during coding interview. It's also useful to learn a couple of tricks and data structure. This problem somewhat has to do with arrays, so we shall be discussing what an array is, But before we dive into this. we need to understand the problem. We are about to solve a coin problem by determining how many possible ways an amount can be paid. Suppose, Mary is a Businesswoman who deals with coin change.
How to print a Right Triangle Pattern in Java - Example Tutorial
Hello Java Programmers, here we are back again with a pattern based exercise. In the past, I have shared article on how to print pyramid pattern of stars in Java, Left Triangle Star Pattern, and Pyramid pattern of alphabets, and in this article, I will show you how to print a right triangle start pattern in Java. Pattern based exercises are great way to learn programming and coding as it encourage you to use logic and use essential programming constructs like loop and arrays.
[Solved] How to convert Decimal to Binary Number in Java? Example Tutorial
Hello guys, how are you doing? I have been sharing a lot of programming interview questions and coding problems for practice in this blog. Earlier, I have shared 21 String programing questions, 100+ data structure questions, and 20 System design questions and this week's programming exercise is to write a program to convert a decimal number to binary in Java. It's a simple exercise for beginners who have just started learning the Java programming language. Decimal numbers are base 10 numbers, which means there are exactly 10 digits to represent a number, starting from 0 to 9, on the other hand, the binary number system has just two digits 0 and 1, which is known as bits.
[Solved] How to find all pairs which add up to a given value in an Integer Array in Java? Example
Hello guys, if you are preparing for programming job interview then you know
that the problem of finding all pairs which adds up to a given value in a give
array is a popular
array based coding question. This question is also known as
Two sum problem
because you need to find pair of two elements in the array whose sum is equal
to given number. For example, you have given an array of integers with
values {1, 2, 3, 4, 5, 6} and
you need to find all the pairs whose sum is equal to 5. In this case, there
are two such pairs (1, 4) and
(2, 3) so your program needs to
print them into console.
2 Ways to solve FizzBuzz in Java? [Example]
Hello guys, if you are learning to code or preparing for interviews and looking how to solve the FizzBuzz problem in Java then you have come to the right place. Earlier, I have shared 75 programming exercises and in this article, I will teach you how to solve the FizzBuzz problem in Java. FizzBuzz is one of the most frequently asked questions on programming interviews and used to filter candidates on Coding interviews who can't code. It looks extremely simple but it's tricky for those programmers or coders who struggle to structure their code or lack the ability to convert a simple algorithm into code.
How to Find Highest Repeating Word from a File in Java [Word Count Solution]
Hello guys, if you are looking for a Java program to print the word and their count from a given file then you have come to the right place. Earlier, I have shared 100+ Data Strucutre and Algorithms Problems from interviews and in this article, I will show you how to find worlds and their count from a given file in Java. How to find the word and their count from a text file is another frequently asked coding question from Java interviews. The logic to solve this problem is similar to what we have seen in how to find duplicate words in a String, where we iterate through string and store word and their count on a hash table and increment them whenever we encounter the same word.
How to Check if Given Number is Prime in Java - With Example
Hello guys, today, we are going to discuss one of the most common programming exercises for beginners is, write a program to check if a given number is prime or not? There are many ways to check if a number is prime or not, but the most common of them is the trial division, which is what we will see in this tutorial. In my opinion, these kinds of programs are their first steps towards algorithmic understanding. You first come up with a solution, which is driven by the fact that prime numbers are natural numbers, that are not divisible by any positive number other than 1 and themselves. Then, you write a for loop to check every number, starting from 1 to a given number, to see if the given number is divisible by any positive number or not. This leads you to the solution.
[Solved] How to Find 2 Largest Number from Integer Array in Java with Example
Hello guys, I have been sharing a lot of Programming interview questions and coding problems to learn programming better which is appreciated by you guys. In this post, I have come with other simple programming problems for Java beginners. I love to share short programming problems because they help in developing programming sense. Many people will argue against simple problems like prime numbers, palindrome, and factorial, but I really find them useful, especially for beginners. A beginner is far away to solve a complex data structure problem or even more complex problems like those that appear in TopCoder or other programming sites. Programmers learn gradually and they need the joy of doing something and seeing results much quicker than any other. Small success motivates them.
[Solved] How to Check If a Given String has No Duplicate Characters in Java? Unique Example
Hello guys, if you are looking to solve the classic problem "checking if a String has all Unique characters" or not then you have come to the right place. Earlier, I have shown you how to reverse String in place, and in this article, I will show you how to check for unique and duplicate characters in String. You need to write a program to determine if a given string has all unique characters or not. For example input= "Java" then your function should return false because all characters are not unique, and if the input is "Python" then your program should return true because all characters in Python are unique.
How to Find Greatest Common Divisor of two numbers in Java - [ Euclid's algorithm GCD Example]
How to find the Greatest Common Divisor of two numbers in Java
Simple Java program to find GCD (Greatest Common Divisor) or GCF (Greatest Common Factor) or HCF (Highest common factor). The GCD of two numbers is the largest positive integer that divides both the numbers fully i.e. without any remainder. There are multiple methods to find GCD, GDF, or HCF of two numbers but Euclid's algorithm is very popular and easy to understand, of course, only if you understand how recursion works. Euclid's algorithm is an efficient way to find the GCD of two numbers and it's pretty easy to implement using recursion in the Java program. According to Euclid's method GCD of two numbers, a, b is equal to GCD(b, a mod b) and GCD(a, 0) = a.
How to calculate sum of all numbers in a given array in Java [Example]
Hello guys, if you are thinking about how to calculate the sum of all numbers in a given integer array then you have come to the right place. Earlier, I have shared 75 programming questions from the interview and in today's coding problem, you will learn how to write a program to calculate the sum of array elements in Java. As part of this coding problem, you need to write a method that will accept an integer array and it should return the total sum of all the elements. The array could contain both positive and negative numbers but only decimal numbers are allowed.
[Solved] 2 Ways to Find Duplicate Elements in a given Array in Java - Example
Hello guys, today, you will learn how to solve another popular coding problem. You have given an array of objects, which could be an array of integers and or an array of Strings or any object which implements the Comparable interface. How would you find duplicate elements from an array? Can you solve this problem in O(n) complexity? This is actually one of the frequently asked coding questions from Java interviews. There are multiple ways to solve this problem, and you will learn two popular ways here, first the brute force way, which involves comparing each element with every other element, and other which uses a hash table-like data structure to reduce the time complexity of the problem from quadratic to linear, of course by trading off some space complexity.
[Solved] How to reverse a String in place in Java? Example
One of the common Java coding interview questions is to write a program to reverse a String in place in Java, without using additional memory. You cannot use any library classes or methods like StringBuilder to solve this problem. This restriction is placed because StringBuilder and StringBuffer class define a reverse() method which can easily reverse the given String. Since the main objective of this question is to test the programming skill and coding logic of the candidate, there is no point in giving him the option to use the library method which can make this question trivial.
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