>> 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
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...
This class is a member of theJava Collections Framework. Since: 1.2 See Also: Collection,Set,HashSet,Comparable,Comparator,TreeMap,Serialized Form Constructor Summary Constructors ConstructorDescription TreeSet() Constructs a new, empty tree set, sorted according to the natural ordering of its element...
User类: package www.entity;import java.util.Objects;public class User implements Comparable {private String name;private int age;@Overridepublic boolean equals(Object o) {System.out.println("执行了");if (this == o) return true;if (o == null || getClass() != o.getClass()) return fal...
1Exception in thread "main"java.lang.ClassCastException: Err cannot be cast to java.lang.Comparable2at java.util.TreeMap.compare(Unknown Source)3at java.util.TreeMap.put(Unknown Source)4at java.util.TreeSet.add(Unknown Source)5at TreeSetErrorTest.main(TreeSetErrorTest.java:13) ...
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。
Constructs a new tree set containing the elements in the specified collection, sorted according to the natural ordering of its elements. TreeSet(IComparator) Constructs a new, empty tree set, sorted according to the specified comparator. TreeSet(IntPtr, JniHandleOwnership) A constructor used wh...
*/publicstaticvoidmain(String[]args){TreeSettreeSet=newTreeSet();treeSet.add(123);treeSet.add(456);treeSet.add(-456);treeSet.add(46);treeSet.add(-1);treeSet.add(0);//treeSet.add("aa");Iteratoriterator=treeSet.iterator();while(iterator.hasNext()){//从小到大遍历输出(可以按照添加对...
TreeMap 和 TreeSet 是 Java Collection Framework 的两个重要成员,其中 TreeMap 是 Map 接口的常用实现类,而 TreeSet 是 Set 接口的常用实现类。虽然 TreeMap 和 TreeSet 实现的接口规范不同,但 TreeSet 底层是通过 TreeMap 来实现的(如同HashSet底层是是通过HashMap来实现的一样),因此二者的实现方式完全一...
Java TreeSet Introduction The TreeSet is one of two sorted collections (the other being TreeMap).TreeSet extends AbstractSet and implements the NavigableSet interface. It creates a collection that uses a tree for storage. Objects are stored in sorted, ascending order according to the natural ...