Java

In Java, the ArrayList is a dynamic array that can store multiple elements of the same type. It's a commonly used data structure in Java and can be initialized in multiple ways. In this article, we will see how to initialize an ArrayList in one line. Code Example Here's the code to initialize an ArrayList in one line using the diamond operator and the Arrays.asList() method: ArrayList colors = new ArrayList<>(Arrays.asList("Red", "Green", "Blue")); Explanation Declaring the ArrayList: The ArrayList<String> is…

In Java, converting a string to an integer (int) can be a common task when working with user inputs or reading data from a file. In this article, we will discuss different methods to convert a string to an integer in Java. Method 1: Using Integer.parseInt() The simplest and most common way to convert a string to an integer in Java is by using the Integer.parseInt() method. This method parses the string representation of an integer and returns the integer…

Iterating over the entries of a Java Map is a common task in programming, and there are several efficient ways to do so. In this blog post, we will explore some of the most commonly used methods and their advantages and disadvantages. 1. Using forEach() method The forEach() method is the most straightforward way to iterate over a Java Map. It is available in Java 8 and later versions. It allows you to execute a block of code for each…

Java provides several ways to generate random integers within a specific range. Here are some methods to generate random integers within a range in Java. Random numbers play a crucial role in many applications, from simulations and games to cryptography and security. In Java, generating random integers within a specific range is a common task that can be accomplished using various methods. Whether you are looking for a quick and simple solution or a more robust and functional approach, Java…

In this post, you will learn how to use a recursive method to calculate the factorial of a number in Java. A recursive method is one that executes itself recursively. Using Java, this recursive method is used to find the factorial of a given integer number. Java Program package in.yawin; public class FactorialRecursive { public static void main(String[] args) { int number = 6; int fact = fact(number); System.out.println("Factorial of " + number + " = " + fact); }…

In fibonacci series, next number is the sum of previous two numbers. Fibonacci series is a series in which the next number is the sum of the previous two numbers.  A number series is said to be a Fibonacci series if the sum of the previous two numbers is the next number. We'll look at how to write a Java programme to print the Fabanocci series in this post. The Fibonacci numbers will begin with 0. The fibonacci series' first two numbers…

In this article, we will define an Armstrong Number in Java. We'll look at how to determine whether a number is Armstrong or not, as well as its code. In Java coding interviews and academics, the Armstrong number programme is frequently asked. Armstrong Number In java, a number is considered an Armstrong number if the sum of its own digits raised to the power number of digits gives the number itself.  A positive m-digit number that is the sum of…

In this post, we'll look at how to write a java program to swap two numbers using third variable. The java program will swap the two given integer numbers using a local variable as a temporary variable. The reassigning variables are used to swap two numbers. The third variable is used as a buffer to hold a value while the values are swapped. Swap two numbers in java The following are the steps for swapping two numbers: Assign a to…

This post demonstrates how to determine whether a given number is odd or even without using the module operator. The given number is divided by two, with the decimals truncated, and then multiplied by two. If the given number is even, this logic returns the same number; otherwise, it returns a different number. Java Program package in.yawin; public class CheckOddOrEven { public static void main(String[] args) { int number = 12; boolean isEven = check(number); if (isEven) { System.out.println("The number…

In this post, we'll look at how to write a Java programme that checks whether a given string is a palindrome. A palindrome string is a string in which the reverse of a string is the same as the original string. A palindrome string is a string that remains the same whether read from left to right or right to left. The palindrome string can be read from both ends. When written backwards, palindrome strings remain unchanged. Palindrome String A…

In this post, we'll look at how to write a java program to swap two numbers without using third variable. The java program will swap the two given integer numbers without using a local variable as a temporary variable. The reassigning variables are used to swap two numbers. The two variables will be used to swap these numbers by using variable value addition and subtraction. Swap two numbers without using third variable in java The following are the steps for…

A palindrome is a number that remains the same when the digits of a number are reversed. Palindrome numbers are 121 and 14541, for example. The reversed number is the same as the given number if the digits of the palindrome numbers are reversed. Palindrome numbers are those listed below that remain the same when written in the opposite order. In this post, we’ll look at how to write a Java programme that checks whether a given number is a…

In this post, we'll look at how to create a Java programme that checks whether a number is even or odd. The whole numbers can be divided into odd and even numbers. Even numbers are divisible by two and have a remainder of zero. The last digits of even numbers are 0, 2, 4, 6, and 8. An odd number is one that can be divided by two but leaves a remainder of one. The last digits of odd numbers…

A leap year is a calendar year with an extra day on February 29th. A year with an extra day. It has 366 days instead of the standard 365. If the year is divisible by 4 but not by 100, or if the year is divisible by 400, it is a leap year. The purpose of the leap year calculation is to compensate for the mismatch between the earth rotation time and the day hours. In this post, we'll look…

A prime number is a whole number greater than one with only the number one and itself as factors. A factor is a whole number that can be evenly divided by another number. Prime numbers are those that have only two factors. A prime number is a number that is only divisible by 1 and itself. So, prime numbers have only two factors, 1 and the number itself. The programme will loop through the given range of numbers and determine…

A prime number is a number that can only be divided by one and itself. So prime numbers have only two factors: 1 and the number itself. In this post, we’ll look at how to create a java program to Check the given number is a prime number or not. Prime Number A prime number is a number that can only be divided only by 1 and itself. A number is not a prime number if the number is divisible…

Factorial means multiplying all whole numbers from the chosen number down to one. The java programme will store a number in a variable to find the factorial of that number. The programme will multiply positive integer numbers beginning with 1 until it reaches the specified number. The result of the number multiplication is the factorial of the given number. In this post, we'll look at how to write a Java programme that calculates the factorial of a number. Factorial of…

Java Program to Add Two Numbers In this post, we'll look at how to create a java programme to add two numbers. Two numbers are assigned to two java integer variables in the Java programme. The sum of the two numbers will be saved in another java integer variable. The total will be displayed in the java program. package in.yawin; public class AddTwoNumbers { public static void main(String[] args) { int a = 5; int b = 4; System.out.println("a value…