在Java 8及以上版本中,我们可以使用Stream API来更加简洁地找出List中的重复元素。 importjava.util.Arrays;importjava.util.List;importjava.util.stream.Collectors;publicclassFindDuplicateElements{publicstaticvoidmain(String[]args){List<Integer>list=Arrays.asList(1,2,3,2);List<Integer>duplicates=list.stream...
如何找出重复元素 在Java中,我们可以使用一些常用的数据结构和算法来快速找出List中的重复元素。其中一种常用的方法是通过使用Set来实现。 List<String>list=Arrays.asList("A","B","C","A","D","E","B");Set<String>set=newHashSet<>();Set<String>duplicates=newHashSet<>();for(Stringelement:list...
Java 8 introduced theStream API, which provides a more concise way of finding duplicates in a List. You can use thedistinct()method to removeduplicatesand compare the size of the original List with the size of the List after removing duplicates. If thesizesare different, it means there were...
Supposexis a list known to contain only strings. The following code can be used to dump the list into a newly allocated array ofString: String[] y = x.toArray(new String[0]); Note thattoArray(new Object[0])is identical in function totoArray(). ...
我们可以使用Java 8的Stream.distinct()方法,该方法返回一个由对象的equals()方法比较的唯一元素组成的流。最后,使用Collectors.toList()将所有唯一元素收集为List。 ArrayList<Integer>numbersList=newArrayList<>(Arrays.asList(1,1,2,3,3,3,4,5,6,6,6,7,8));List<Integer>listWithoutDuplicates=numbersList...
List: Lists allow duplicate elements. You can have multiple elements with the same value in a List. Set: Sets do not allow duplicate elements. If you attempt to add an element that already exists in the Set, it will be ignored, and the Set will remain unchanged....
When we call the distinct method of the Java Stream API, this removes duplicates from the returned list. When we print out the list’s size a second time the output is six, which is the number of unique elements in the List. myList = myList.stream().distinct().toList()System.out....
Given a sorted linked list, delete all duplicates such that each element appear onlyonce. Example 1: Input: 1->1->2 Output: 1->2 Example 2: Input: 1->1->2->3->3 Output: 1->2->3 很简单的链表问题,可以写成递归和迭代两种形式。具体思路: ...
An ordered collection(also known as asequence).The user of this interface has precise control over where in the list each element is inserted.The user can access elements by their integer index(position in the list), and search for elements in the list. Unlike sets, lists typically allow d...
To preserve the original order, we can use LinkedHashset instead. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 import java.util.*; class Main { public static void main(String[] args) { // input list with duplicates List<String> listWithDuplicates = new ArrayList<>(Arrays...