Java Articles - Page 67 of 745

An array is a linear data structure that stores a group of elements with similar datatypes, in a sequential order. Once we create an array, we can’t change its size, i.e., it can store a fixed number of elements. In this article, we will learn how to write a Java program where we create an array and perform the right rotation using the reversal algorithm. Right Rotation of an Array Let’s understand the term right rotation in the context of an array. In the right rotation of an array, we simply shift the elements of the array to our right till the specified number ... Read More

The Java program starts execution when the JVM calls the main() method. A Java application begins with this method. Without a main() method, a Java file will compile successfully because at compile time, the compiler doesn't check for a main method, but at run time JVM checks whether the main() method is available or not. Therefore, we will get an exception at run time. In this article, we will understand why we follow the convention "public static void main(String[] args)." The Syntax of a basic Java program looks like: public class class_name { // This line must be ... Read More

The given task is to write a Java program to convert it into its equivalent decimal number system. The base value of hexadecimal is 16, and decimal is 10. When we convert the hexadecimal to decimal, the base value 16 will be changed to 10. The number system is of four types: Binary, Octal, Decimal, and Hexadecimal. The base value depends on the number of digits contained by the number system. For example, the binary number system contains only two digits, 0 and 1. Hence, its base is 2. Hexadecimal Number System It represents the numbers from 0 to 9 ... Read More

The given task is to write a Java program that converts an integer into a character. The int and char are primitive datatypes of Java. The int is a 32-bit signed datatype used to store whole numbers, and char holds 16-bit unsigned Unicode characters. The int and char keywords are used to declare an integer variable and a character variable, respectively. We store character variables in a single quotation (' '). Example Scenario To understand the problem statement, let's see an example scenario: Input: int num1 = 83; Output: ch = 'S' Here, num1 is the name of a ... Read More

Array is a linear data structure that is used to store a group of elements with similar data types. It stores data in a sequential manner. When we create an array of two dimensions, i.e., rows and columns, we call it a matrix. In this article, we will create a matrix of M x N and try to rotate it right by K times. Here, M and N are the size of the row and column, respectively. K is the number of times we want to rotate the matrix. Example Scenarios Let's understand what matrix rotation is with the following ... Read More

Loops in Java are called control statements because they decide the flow of execution of a program based on some condition. Java allows the nesting of loops. When we put a loop within another loop, then we call it a nested loop. Nested loops are used when we need to iterate through a matrix array and when we need to do any pattern-based questions. In this article, we are going to learn about Java nested loops with examples. Nested Loops in Java We can create nested loops for the following control statements in Java: ... Read More

Array is a linear data structure that is used to store a group of elements with the same data type. We can create an array with primitive datatypes, and since a class is considered a user-defined datatype in Java,  it is also possible to create an array of objects. In this article, we are going to discuss object arrays. First of all, let's discuss what is an object array, in Java. What is Object array or Array of Objects An array of objects contains reference variables of objects.We follow the same syntax to create an array of primitives and an array ... Read More

After JDK version 5, Java introduced the enumeration. It is a group of constants defined using the keyword enum. The final variables in Java are somewhat similar to enumeration. In this article, we will write Java programs in which we define an enum class and try to access all the constants defined in the enum using valueOf() and values() methods. The Java Enum Class We use enum class when we need to define a fixed set of constants. For example, if we want to use the days of the week, planet names, names of all five vowels, etc. Note that all the ... Read More

Array is a linear data structure that is used to store a group of elements with similar data types. It stores data in a sequential manner. Once we create an array, we can't change its size, i.e., it is of fixed length. This article will help you to understand the basic concept of arrays and array bounds in Java. Also, we will discuss Java programs to check array bounds while inputting elements into the array. Array and Array Bound We can access elements of an array by its index. Suppose we have an array of length N, then ... Read More

In Java, the static methods are defined using static keywords but to declare instance variables we don't use static keywords. Generally, we can't access the instance variable by a static method. In this article, we will create an instance variable and then we will check the accessibility of that instance variable by a static method. Let's understand static method and instance variable first. Java Instance Variable In the context of programming language, variables are the name of containers that contain data of any type. We can say it is a storage unit. A variable can be initialized at the time ... Read More