衍生集合
作者:互联网
1 object Test12_DerivedCollection { 2 def main(args: Array[String]): Unit = { 3 val list = List(1, 2 ,3 ,4 ,5, 6) 4 val list1 = List(1, 2, 3, 11, 22, 33) 5 6 //1、获取集合的头 7 println(list.head) 8 9 //2、获取集合的尾(头剩下的都是尾) 10 println(list.tail) 11 12 //3、集合最后一个数据 13 println(list.last) 14 15 //4、集合初始数据(不包含最后一个) 16 println(list.init) 17 18 //5、反转 19 println(list.reverse) 20 21 //6、取前(后)n个元素 22 //前 23 println(list.take(3)) 24 //后 25 println(list.takeRight(2)) 26 27 //7、去掉前(后)n个元素 28 29 println(list.drop(2)) 30 println(list.dropRight(3)) 31 32 //8、并集 33 val union = list.union(list1) 34 println("union: " + union) 35 36 //如果是set做并集,会去重 37 val set = Set(1, 2 ,3 ,4 ,5, 6, 7) 38 val set1 = Set(1, 2, 3, 11, 22, 33, 55) 39 val union1 = set.union(set1) 40 println("union1: " + union1) 41 42 println("-------------------------------") 43 44 //9、交集 45 val intersection = list.intersect(list1) 46 println("intersection: " +intersection) 47 48 println("-----------------------------") 49 50 //10、差集 51 val diff = list.diff(list1) 52 println("diff:" + diff) 53 54 val diff1 = list1.diff(list) 55 println("diff1: " + diff1) 56 57 println("----------------------------------") 58 59 //11、拉链 60 println("zip: " + list.zip(list1)) 61 println("zip: " + list1.zip(list)) 62 63 println("----------------------------------") 64 65 //12、滑窗 66 //窗口的大小为3 67 for (elem <- list.sliding(3)) println(elem) 68 println("----------------------------") 69 //隔两个滑窗一次 70 for (elem <- list1.sliding(4, 2)) println(elem) 71 println("-----------------------") 72 //滚动窗口,窗口大小和相隔数相同 73 for (elem <- list1.sliding(3, 3)) println(elem) 74 } 75 }
标签:val,union,list1,list,println,集合,diff,衍生 来源: https://www.cnblogs.com/xiao-wang-tong-xue/p/16287438.html