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Java Technologies Articles
Found 40 articles
Java program to reverse a string using recursion
In this article, we will learn to reverse a string using recursion in Java. Recursion is the process of repeating items in a self-similar way. In programming languages, if a program allows you to call a function inside the same function, then it is known as a recursive call of the function. You can reverse a string using the recursive function as shown in the following program. Steps to reverse a string using recursion Following are the steps to reverse a string using recursion - Create a class called StringReverse with a method reverseString that takes ...
Read MoreJava program to find the area of a square
Given a square whose length of all its sides are l, write a Java program to find its area. A square is a rectangle whose length and breadth are same. Therefore, area of this type of rectangle is the square of its length. To calculate the area of square in Java, you simply need to multiply the given length of square with the length itself and store the result in another variable. Java Program to Find The Area of a Square A Java program that illustrates how to find the area of the square is shown below − public class ...
Read MoreJava program to delete duplicate characters from a given String
The Set interface does not allow duplicate elements, therefore, create a set object and try to add each element to it using the add() method in case of repetition of elements this method returns false − If you try to add all the elements of the array to a Set, it accepts only unique elements so, to find duplicate characters in a given string. Problem Statement Given a string, write a program in Java to delete duplicate characters from a given string − Input TUTORIALSPOINT Output Indices of the duplicate characters in the given string :: Index :: ...
Read MoreJava program to Print Odd and Even Number from an Array
Given an array of type Integer, write a Java program to find the odd and even numbers from that array. Those numbers which are completely divisible by 2 are called even numbers and if a number gives 1 as a remainder on dividing with 2 is known as odd number. Printing Odd and Even Number from an Array To print odd and even number from an array in Java, use the following ways − Using for Loop Using stream API Using for Loop In this approach, use the for ...
Read MoreJava program to calculate the product of two numbers
The * operator in Java is used to multiply two numbers. Read required numbers from the user using Scanner class and multiply these two integers using the * operator.Exampleimport java.util.Scanner; public class MultiplicationOfTwoNumbers { public static void main(String args[]){ Scanner sc = new Scanner(System.in); System.out.println("Enter the value of the first number ::"); int a = sc.nextInt(); System.out.println("Enter the value of the first number ::"); int b = sc.nextInt(); int result = a*b; System.out.println("Product of the given two numbers ...
Read MoreJava program to find the sum of elements of an array
To find the sum of elements of an array.create an empty variable. (sum)Initialize it with 0 in a loop.Traverse through each element (or get each element from the user) add each element to sum.Print sum.Exampleimport java.util.Arrays; import java.util.Scanner; public class SumOfElementsOfAnArray { public static void main(String args[]){ System.out.println("Enter the required size of the array :: "); Scanner s = new Scanner(System.in); int size = s.nextInt(); int myArray[] = new int [size]; int sum = 0; System.out.println("Enter the elements of the array one by one "); for(int i=0; i
Read MoreDifferent Ways to Print First K Characters of the String in Java
A string is a class in Java that stores a series of characters enclosed within double quotes.Those characters are actually String-type objects. The string class is available in the‘java.lang’ package. Suppose we have given a string and a positive integer ‘k’. Now, thejob is to print that string's first 'k' characters in Java. Also, check whether the length ofgiven string is less than or not, if so print the original string. Java Program to Print First K Characters of the String Let’s understand the given problem with a few examples − Instance String st1 = “TutorialsPoint”; String st2 = “Tutorial”; ...
Read MoreWhat are the key features of Java?
This article will help you understand what the key features of Java Programming language are. The Key features of Java Programming Language are − Java is Easy to Understand Java’s base is similar to that of C and C++ languages and it includes many important features of these languages. It removes many drawbacks and complexities of C or C++. So if one has good understanding of either C or C++, then Java language will be very familiar and easily understandable. Java is an object oriented programming language Object Oriented Programming (OOP) is an approach to standardize the programs by creating ...
Read MoreMatch all occurrences of a regex in Java
public class RegexOccur { public static void main(String args[]) { String str = "java is fun so learn java"; String findStr = "java"; int lastIndex = 0; int count = 0; while(lastIndex != -1) { lastIndex = str.indexOf(findStr,lastIndex); if(lastIndex != -1) { count ++; lastIndex += findStr.length(); } } System.out.println(count); } }Output2
Read MoreJava labelled for loop
Following program is using labeled for loops.ExampleLive Demopublic class Tester { public static void main(String args[]) { first: for (int i = 0; i < 3; i++) { for (int j = 0; j< 3; j++){ if(i == 1){ continue first; } System.out.print(" [i = " + i + ", ...
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