EnumSet complementOf(EnumSet e): 创建一个其元素类型与指定EnumSet里元素类型相同的EnumSet集合,新EnumSet集合包含原EnumSet集合所不包含的、此类枚举类剩下的枚举值(即新EnumSet集合和原EnumSet集合的集合元素加起来是该枚举类的所有枚举值)。 EnumSet copyOf(Collection c): 使用一个普通集合来创建EnumSet集合。 EnumS...
Java Collection框架(七)红黑树与TreeNode源码浅析 2018年拍摄于京都平安神宫内。 今天看树型数据结构。 树 上图是一个简单的树形结构,最顶层为一个根节点,向下延伸出树杈和叶子构成一个具有层次关系的集合,例如前端树形插件Ztree,用过的朋友都很熟悉知道这个结构。 一个节点也是一颗树,这个节点就是root根节点,上...
1importjava.util.Date;2importjava.util.TreeSet;345publicclassTreeSetErrorTest2 {67publicstaticvoidmain(String[] args) {89TreeSet tSet =newTreeSet<>();10tSet.add(newString("黑马程序员"));11tSet.add(newDate());12}1314} 运行结果: Exception in thread "main"java.lang.ClassCastException: ja...
I am familiar with Java Collection Framework which contains basic interfaces: Collection and Map. I am wondering why the Framework doesn’t contain structures as Tree and Graph which are basic collections. Both can be regarded as sub types of Collection. By the way, I know TreeSet is implemen...
1.Collection接口:单列集合,用来存储一个一个的对象 2.Set接口:存储无序的,不可重复的数据 ,说白了就是高中讲的"集合" 3.HashSet接口:作为Set接口的主要实现类,线程不安全的,可以存储null值 4.LinkedHashSet:作为HashSet的子类,遍历其内部数据时,可以按照添加的顺序进行遍历。
>> check out the course 1. overview in this article, we’ll have a look at an integral part of the java collections framework and one of the most popular set implementations – the treeset . 2. intro to treeset simply put, the treeset is a sorted collection that extends the abstract...
Collection<V>values() Returns a Collection view of the values contained in this map. Methods inherited from class java.util.AbstractMap equals, hashCode, isEmpty, toString Methods inherited from class java.lang.Object finalize, getClass, notify, notifyAll, wait, wait, wait Methods inherited from...
TreeSet(Collection<? extendsE> c) Constructs a new tree set containing the elements in the specified collection, sorted according to thenatural orderingof its elements. TreeSet(Comparator<? superE> comparator) Constructs a new, empty tree set, sorted according to the specified comparator. ...
1 import java.util.Iterator; 2 import java.util.TreeSet; 3 public class StudentCode { 4 5 public static void main(String []args){ 6 //定义TreeSet对象,并赋值java存在的对象 7 TreeSet ts1=new TreeSet(); 8 ts1.add("java10"); 9 ts1.add("java01"); 10 ts1.add("java08"); 11...
In this case, we provide all of our points at construction time, but you may also create an empty tree and add points later. TheVPTreeclass implements Java'sCollectioninterface and supports all optional operations. Note that aVPTreehas two generic types: a general "base" point type and a...