Java program to merge contents of all the files in a directory
Prerequisite : PrintWriter, BufferedReader. We are given a directory/folder in which n number of files are stored(We dont know the number of files) and we… Read More »
Category Archives: Java Programs
Closest perfect square and its distance
Given a positive integer . The task is to find the perfect square number closest to N and steps required to reach this number from… Read More »
AbstractCollection retainAll() method in Java with Examples
The retainAll() method in AbstractCollection helps in retaining elements of the specified collection from another collection and removes the unmatched elements from the result. Syntax:… Read More »
Binary Search a String
Given a sorted array of String and a String x, find index of x if it is present in the array. Examples: Input : arr[]… Read More »
Minimum absolute difference of a number and its closest prime
Given a positive integer N, the task is to find the absolute difference of N and the prime number closest to N . Note: The… Read More »
Sort the array in a given index range
Given an array arr[] of N integers and an index range [a, b]. The task is to sort the array in this given index range… Read More »
Maximum sum by picking elements from two arrays in order
Given two arrays of size N and two integers X and Y indicating the maximum number of elements one can pick from array A and… Read More »
Java substring() method memory leak issue and fix
String is a special class in Java. substring() is one of the widely used methods of String class. It is used to extract part of… Read More »
Sum of first N natural numbers when N is extremely large
Given a positive integer n, the task is to find the sum of the first n natural numbers given that n is very large (1… Read More »
Dijkstra’s shortest path algorithm in Java using PriorityQueue
Given a graph with adjacency list representation of the edges between the nodes, the task is to implement Dijkstra’s Algorithm for single source shortest path… Read More »
Check if the given decimal number has 0 and 1 digits only
Given an integer n, the task is to check whether n is in binary or not. Print true if n is the binary representation else… Read More »
List add(E ele) method in Java with Examples
The add(E ele) method of List interface in Java is used to insert the specified element to the end of the current list. Syntax: public… Read More »
Min Heap in Java
A Min-Heap is a complete binary tree in which the value in each internal node is greater than or equal to the values in the… Read More »
Students with maximum average score of three subjects
Given a file containing data of student name and marks scored by him/her in 3 subjects. The task is to find the list of students… Read More »
Move all Uppercase char to the end of string
Given a string, move all Uppercase alphabets char to the end of the String. Examples: Input : Geeksforgeeks A Computer Science Portal for Geeks!! Output… Read More »
