How to implement SQL GROUP BY in Java?
Prerequisites: Java Collections, Java Array List, Comparator Interface in Java Given a list object containing multiple records, our task is to perform SQL group by… Read More »
Category Archives: Java Programs
What is the Role of Java in the IT Industry?
The IT industry, especially in India, heavily uses Java in most of their projects. Being a Java developer, one should have the knowledge about the… Read More »
Convert a String to Character array in Java
Given a string, the task is to convert this string into a character array in Java. Examples: Input: Hello World Output: [H, e, l, l,… Read More »
Queries to find the first non-repeating character in the sub-string of a string
Given a string str, the task is to answer Q queries where every query consists of two integers L and R and we have to… Read More »
Count occurrences of a given character using Regex in Java
Given a string and a character, the task is to make a function which counts the occurrence of the given character in the string using… Read More »
BigDecimal sqrt() Method in Java with Examples
The java.math.BigDecimal.sqrt(MathContext mc) is an inbuilt function added in Java SE 9 & JDK 9 which returns BigDecimal value of square root of a BigDecimal… Read More »
Java Applet | How to display a Digital Clock
In this article, we shall be animating the applet window with a 1-second delay. The idea is to display the system time of every instance.… Read More »
Difference between an Iterator and ListIterator in Java
Iterator Iterators are used in Collection framework in Java to retrieve elements one by one. It can be applied to any Collection object. By using… Read More »
Graph Representation using Java ArrayList
Prerequisite : Graph and its representations In this article, we will be discussing Adjacency List representation of Graph using ArrayList in Java. Following is adjacency… Read More »
File Handling in Java with CRUD operations
So far the operations using Java programs are done on a prompt/terminal which is not stored anywhere. But in the software industry, most of the… Read More »
Check if two strings are same ignoring their cases
Given two strings str1 and str2. The task is to check if the two given strings are same if a case-insensitive comparison is followed, i.e.,… Read More »
Capitalize the first and last character of each word in a string
Given the string, the task is to capitalise the first and last character of each word in a string. Examples: Input: Geeks for geeks Output:… Read More »
TCS Coding Practice Question | Check Armstrong Number
Given a number, the task is to check if this number is Armstrong or not using Command Line Arguments. A positive integer of n digits… Read More »
TCS Coding Practice Question | Check Odd or Even
Given a number, the task is to check if this number is Odd or Even using Command Line Arguments. A number is called even if… Read More »
TCS Coding Practice Question | Fibonacci Series
Given a number ‘n’, the task is to print the the Fibonacci series using Command Line Arguments. The Fibonacci numbers are the numbers in the… Read More »
