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Java Articles
Page 135 of 450
Java program to check if a given number is perfect number
When the sum of factors of a given number (after discarding the given number) is equal to the number itself is called a perfect number. The sum of these divisors is known as the aliquot sum. Therefore, we can say that a number is perfect if it matches its aliquot sum. All known perfect numbers are even. Problem Statement In this article, we will create Java programs to check if a given number is perfect or not. Let's try to understand the given problem through some examples: Example Scenarios: Input: number = 496 Output: 496 is a perfect number ...
Read MoreJava program to check whether a number is even or odd
We are given an integer number as input, and our task is to write a Java program to check whether that number is even or odd. If a number is divisible by 2, then it is an even number otherwise, it is odd. To verify a given number is even or odd in Java, we can use 3 different ways one with the modulus operator (%), another with the bitwise AND operator (&), and a third one using a switch statement. Example Scenarios: Let's understand the problem statement with some example scenarios: Input: number = 45 Output: result = odd ...
Read MoreHow can we convert a JSONArray to String Array in Java?
A JSONArray is a class provided by the org.json package that represents a collection of JSON values. These values can be of any type, such as strings, numbers, booleans, or even nested objects or arrays. If you do not know what JSON is, then you can read the JSON tutorial. Converting JSON Array to String ArrayWe can convert a JSONArray to String Array by using a simple loop as shown in the example below - import org.json.*; import java.util.*; public class JsonArraytoStringArrayTest { public static void main(String[] args) { ...
Read MoreHow To Find the Midpoint of a Line in Java?
Midpoint of a Line The midpoint refers to a point that is exactly in the middle of the line segment, which is joined through two points. These are the endpoints of a line segment and the midpoint lying in between these two points. The following diagram will provide a better understanding: Midpoint Formula The midpoint formula is defined for the points in the coordinate axes (i.e., x and y). Let's consider (x1, y1) and (x2, y2) are the endpoints of a line segment. The midpoint will be equal to half of the sum of the x-coordinates of the two ...
Read MoreHow to iterate List Using Streams in Java?
In Java, a List is an interface that stores a sequence of elements of similar type. Java provides various ways to iterate over a list, such as using a for loop, forEach loop, iterator object, stream, or forEach() method with a lambda expression. What is Stream in Java? In Java, a Stream is an interface, which represents a sequence of elements (or objects) supporting sequential and parallel aggregate operations. These operations can be used to produce the desired result. The Stream interface provides a method named stream(), which is used to create a sequential stream from the current collection (or ...
Read MoreHow To Find Minimum Height of the Triangle with Given Base and Area in Java?
The height of a triangle is the perpendicular distance from a vertex to the line containing the opposite side (which is the base). The height is also known as altitude. What is Minimum Height? The minimum height of a triangle refers to the shortest possible altitude (perpendicular distance) from a vertex to the opposite side (base). The following diagram provides you with a clear idea of the triangle's height and its base: A triangle is a polygon (a basic shape in geometry) that has three sides and three corners. The corners, also called vertices, are zero-dimensional points, while ...
Read MoreHow To Check Whether a Number is a Unique Number or Not in Java?
What is Unique Number? A Unique number is a number that does not have a single repeated digit in it. In other words, a number in which all the digits are present exactly only one time. For example, consider the number 12. The digits 1 and 2 each appear only once, the number is unique as it contains all distinct digits. Here are some other examples of unique numbers such as 132, 1, 45, 98, 701, 5, 12, 1234, etc. Input & Output Scenarios Below are the few of the input and output scenarios which gives some idea about ...
Read MoreHow To Check Whether a Number is a Sunny Number or Not in Java?
What is Sunny Number? A number is said to be a Sunny number if the square root of the next value of the given number is a perfect square of any number. For example, let's consider the number 3. If we take the number after 3, which is 4, and 2 is its perfect square root. Here are some other examples of sunny numbers such as 3, 8, 15, 24, 35, 48, 63, etc. Input & Output Scenarios Following are some input and output scenarios that provide a better understanding of the sunny number: Scenario 1 Suppose the given input ...
Read MoreHow To Check Whether a Number Is a Niven Number or Not in Java?
What is Niven Number? A Niven number is a number that is completely divisible by the sum of its digits. For example, consider the number 20. If we calculate the sum of its digits, 2 + 0, we get 2. When we divide 20 by 2 (20 / 2), the remainder is 0 (which means it is completely divisible). Here are some other examples of Niven numbers such as 1, 2, 4, 5, 6, 7, 8, 9, 10, 12, 18, 20, etc. Input & Output Scenarios The following input and output scenarios will give you an idea of how to ...
Read MoreHow to Check Whether a Number is Krishnamurthy Number or Not in Java?
What is the Krishnamurthy Number? The Krishnamurthy number is a number which the sum of the factorials of all its digits is equal to the original number. These numbers are also called the Strong number, Special number, and the Peterson number. For example, let's take the number 40585. Now, calculate the sum of the factorials of its digits: 4! + 0! + 5! + 8! + 5!. The sum is equal to 40585. If you compare it with the original number, you can see that both are the same. Here are some other examples of Krishnamurthy numbers, such as 1, 2, ...
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