import java.util.ArrayList;import java.util.HashSet;import java.util.Iterator; public class Hashset { public static void main(String[] args){ ArrayList list = new ArrayList(); list.add("1"); list.add("2"); list.add("2"); @Sup…
set集合,是一个无序且不重复的元素集合 class set(object): """ set() -> new empty set object set(iterable) -> new set object Build an unordered collection of unique elements. """ def add(self, *args, **kwargs…
1.方法一 将数组逐个搬到另一个数组中,当遇到重复元素时,不移动,若元素不重复则移动到新数组中 function unique(arr){ var len = arr.length; var result = [] for(var i=0;i<len;i++){ var flag = true; for(var j = i;j<arr.length-1;j++){ if(arr[i]==arr[j+1]){ flag = false; break; } } if(flag){ result.p…
今天碰到一个问题,想了好久都没有明白,网上找了一个文章,先收藏起来,有空了一定要想明白 用Set ,倘若list里边的元素不是基本数据类型而是对象,那么请覆写Object的boolean equals(Objectobj) 和int hashCode()方法. return new ArrayList(new HashSet(list)); 方法一:循环元素删除 public static void removeDuplicate(List list) { for ( int i = 0 ; i…
方法一: >>> mylist = [1,2,2,2,2,3,3,3,4,4,4,4] >>> myset = set(mylist) >>> for item in myset: print("the %d has found %d" %(item,mylist.count(item))) the 1 has found 1 the 2 has found 4 the 3 has found 3 the 4 has found 4…