java中怎样去除list中重复的数据,并且显示重复数据的条数答:其实你这个问题,总来说就是按照集合中的字符串进行分类,并统计数量,Stream只用简单的代码就完成复杂的操作,代码如下 List<String> list = Arrays.asList("day", "walipo", "day", "walipo", "legeand", "day", "douwbo", "day", "day");Map<String, Long> collect = list.stream()...
Java中如何对list集合中相同的元素分类答:import java.util.Arrays;import java.util.Iterator;import java.util.List;import java.util.TreeSet;public class MyCount { public static void main(String[] args) { Integer[] arr={1,2,2,2,2,4,4,4,6,6,6,6,12,12,13,13,13,16,17,19,19,19,36,39};List<Integer> numList=...