下面的程序演示了HashSet支持的几种方法: importjava.util.*;publicclassHashSetDemo{publicstaticvoidmain(Stringargs[]){// create a hash setHashSeths=newHashSet();// add elements to the hash seths.add("B");hs.add("A");hs.add("D");hs.add("E");hs.add("C");hs.add("F");System.out.println(hs);}} Java Copy 这将产生以下结果...
importjava.util.HashSet;classHashSetDemo{publicstaticvoidmain(String[]args){// Create a HashSetHashSet<String>hset=newHashSet<String>();//add elements to HashSethset.add("AA");hset.add("BB");hset.add("CC");hset.add("DD");// Displaying HashSet elementsSystem.out.println("HashSet co...
HashSet不保证输出的顺序。 例:2.1.1 import java.util.*; public class TestMark_to_win { public static void main(String args[]) { HashSet h = new HashSet(); h.add("1"); h.add("2"); h.add("3"); h.add("4"); System.out.println(h); } }...
Methods declared in interface java.util.Set addAll,containsAll,equals,hashCode,removeAll,retainAll,toArray,toArray Constructor Detail HashSet public HashSet() Constructs a new, empty set; the backingHashMapinstance has default initial capacity (16) and load factor (0.75). ...
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HashSet也是线程不安全的,我们可以使用Set s = Collections.synchronizedSet(new HashSet(...))包装一个线程安全的Set HashSet中的元素不可重复,因为HashMap中的key不可重复,重复的key会覆盖其value。 参考 Java Platform SE 8docs.oracle.com/javase/8/docs/api/ 欢迎关注我的微信公众号:百科java...
This class is a member of theJava Collections Framework. Added in 1.2. Java documentation forjava.util.HashSet. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commons 2.5 Attribution Lic...
The linked hash set is created with an initial capacity sufficient to hold the elements in the specified collection and the default load factor (0.75). Java documentation for java.util.LinkedHashSet.LinkedHashSet(java.util.Collection<? extends E>). Portions of this page are modifications based ...
getLastin interfaceSequencedCollection<E> Returns: the retrieved element Throws: NoSuchElementException- if this collection is empty Since: 21 removeFirst publicEremoveFirst() Removes and returns the first element of this collection (optional operation). ...
origin: GoogleCloudPlatform/java-docs-samples Index.lookup(...) /** * Looks up the set of documents containing each word. Returns the intersection of these. */ public ImmutableSet<String> lookup(Iterable<String> words) { HashSet<String> documents = null; try (Jedis jedis = pool.get...