How to sort an array using QuickSort Algorithm in Java? (solution) How to sort an ArrayList in descending order in Java? (example) How to sort objects in Java? (answer) Difference between HashSet and HashMap in Java? (answer) Difference between LinkedHashSet, TreeSet, and HashSet in Ja...
Then comes the question how does hashing help in storing and retrieving the value in HashMap. Many answers the value will be stored in the bucket and retrieved using the key if you think that is how it works then you are absolutely wrong. To prove let’s take a look at the hashmap c...
And, here is the complete Java program to find duplicate characters in a given String. import java.util.HashMap; import java.util.Map; import java.util.Scanner; import java.util.Set; /** * Java Program to find duplicate characters in String....
Cache will keep most recently used items if you will try to add more items then max specified. (apachecommon collectionshas aLRUMap, which, removes the least used entries from afixed sizedmap) For theexpirationof items we can timestamp the last access and in a separate thread remove the i...
i am trying to remove the duplicate values from HashMap by the following code but it is thwoing following exception java.util.ConcurrentModificationException how to remove duplicate values ? import java.util.Enumeration; import java.util.HashMap; import java.util.Iterator; import java.util...
Input data: Schedule amt Expenses 100 Expenses 200 Expenses 300 Output data: Schedule amt Expenses 100 200 300
In this tutorial we will go over steps on how to remove duplicates from aCSV fileand any other file. Let’s get started: Step-1. Create fileCrunchifyFindDuplicateCSV.java Step-2. Put below code into file. We are usingBufferedReaderto read files. ...
In this tutorial, you will learn how to remove duplicates from ArrayList. Example 1: Removing duplicates from ArrayList using LinkedHashSet In the following example, we are removing the duplicate elements from ArrayList using LinkedHashSet. The steps fol
Because if my object has 3 different attributes, depending on the value i should create and put them in 3 different hashmap, which is unnecessarily loading the memory thrice with the same objects. No, the objects don't need to be more than once in memory. You can put the same object ...
For example,if you want to find all the guys who work in the UK, you’ll have to look at each row to find if the row belongs to the UK.This will cost you N operations(N being the number of rows) which is not bad but could there be a faster way? This is where trees come in...