The HashSet class is available in java.util package. By using HashSet class, we can remove the duplicate element from the ArrayList. In case of HashSet, after removing the duplicate elements, The insertion order of the elements is not preserved (i.e. The retrieval order of the elements ...
Using a Java Set to Remove Duplicates in a List Alternatively, we can use one of the Java Set implementations to deduplicate a Java List.Java Setis a distinct collectionof elements. Please note that we can use HashSet to remove duplicate elements from a List, but it is an unordered collec...
1HashSet<String> criterSet =newHashSet<String>(criteriaList); //new了一个set集合对象,然后将上面得到的criteriaList放入到里面,此时虽说criteriaList中有重复的元素,但是这时候得到 的criterSet中是不存在重复值的,不知道这是不是set的特性(在内部的处理机制),明天问下公司大神。2criteriaList.clear();3criter...
This post will discuss how to remove duplicates from a list in Java without destroying the original ordering of the list elements. 1. Plain Java We know that a set doesn’t allow any duplicate elements. So if we convert the given list with duplicates to a set, we’ll get a set of ...
Learn to remove duplicate elements from an ArrayList using different techniques such as HashSet, LinkedHashSet, and using Java 8 stream. Learn toremove duplicate elements from a List in JavausingCollection.removeIf(),HashSet,LinkedHashSet,and Stream APIs. ...
Few simple examples to find and count the duplicates in aStreamand remove those duplicates sinceJava 8. We will useArrayListto provide aStreamof elements including duplicates. 1. Stream.distinct() – To Remove Duplicates 1.1. Remove Duplicate Strings ...
在Java中可以使用replace函数。 /*** 递归方法求解res *@params *@return*/publicstaticString removeDuplicate_Recursively(String s){if(s ==null)returnnull;intlen =s.length();if(len == 0)return"";/**存储字符及个数*/Map<Character,Integer> map =newHashMap<Character,Integer>();for(inti = 0...
Copying all the elements ofLinkedHashSet(non-duplicate elements) to the ArrayList. Please find below the complete code : importjava.util.ArrayList;importjava.util.LinkedHashSet;importjava.util.List;importjava.util.Set;/** * Java Program to remove repeated elements from ArrayList in Java. ...
Program to remove duplicate elements in javaimport java.util.Scanner; public class RemoveDuplicateElementFromArray { public static void main(String[] args) { /* Array instantiation */ int[] arr_elements = new int[20]; /* initial_element variable initialize by 0 and point to the first ...
Java Stream distinct() forEach() Example Stream distinct() with custom objects Let’s look at a simple example of using distinct() to remove duplicate elements from alist. package com.journaldev.java; import java.util.ArrayList; import java.util.List; ...