import java.util.ArrayList;import java.util.List;public class Main { public static void main(Strin...
In this post, I will show you how to find duplicate objects in a List using Java’s Comparator interface implementation based on multiple fields in a POJO. Prerequisites The following configurations are required in order to run the application Eclipse JDK 1.8 Have maven installed and configured J...
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...
publicstaticList<String>findRepeat1(List<String>dataList){// hashCode方法的返回值类型是int，所以直...
importjava.util.*;publicclassFindDuplicateElements{publicstaticvoidmain(String[]args){List<Integer>list=Arrays.asList(1,2,3,4,2,3,5,6,4);Map<Integer,Integer>map=newHashMap<>();for(Integeri:list){if(map.containsKey(i)){map.put(i,map.get(i)+1);}else{map.put(i,1);}}for(Map.En...
public int findDuplicate(int[] nums) { int min = 0, max = nums.length - 1; while(min <= max){ // 找到中间那个数 int mid = min + (max - min) / 2; int cnt = 0; // 计算总数组中有多少个数小于等于中间数 for(int i = 0; i < nums.length; i++){ ...
1classSolution {2publicList<List<String>>findDuplicate(String[] paths) {3//存放结果4List < List <String>> res =newArrayList<>();5//key-文件内容, value-路径和文件名6Map<String, List<String>> map =newHashMap<>();7for(String path : paths){8//以空格为分割符分割出路径和文件9String[...
// 第二种方式Java8 StreamMap<Integer, List<Integer>> map1 = list.stream().collect(Collectors.groupingBy(Function.identity(), Collectors.toList()));System.out.println(map1);一行代码就搞定了，这里采用的是Collectors.groupingBy方法进行归类数据，里面两个参数代表分别代表：如何把流中的数据...
3. Find Duplicate Words usingCollections Largely, the process to find the duplicates using Collections is simlar to previous approach. We start with splitting the string and collecting all words in aList. Then we use theHashSet.add()method to check if the word is unique or duplicate. ...
public class FindDuplicateCharacters{ public static void main(String args[]) { printDuplicateCharacters("Programming"); printDuplicateCharacters("Combination"); printDuplicateCharacters("Java"); } /* * Find all duplicate characters in a String and print each of them. ...