package com.zking.Collection02.util; import java.util.Set; import java.util.TreeSet; import com.zking.Collection02.entity.Student; public class Demo2 { public static void main(String[] args) { //TreeSet:以某种特定的规则对集合中的元素进行排序(升序和降序) //java.lang.Comparable:自然比较接口...
import java.util.List;publicclassTestArrayList {publicstaticvoidmain(String[] args) {//Collection list = new ArrayList();List list =newArrayList();//添加元素list.add("aa"); list.add("bb"); list.add("cc"); list.add(2,"dd");//遍历输出for(inti=0;i<list.size();i++){ Stringstring...
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...
(add,containsandremove), assuming the hash function disperses elements properly among the buckets. Performance is likely to be just slightly below that ofHashMap, due to the added expense of maintaining the linked list, with one exception: Iteration over the collection-views of aLinkedHashMap...
This class is a member of theJava Collections Framework. Implementation Note: The spliterators returned by the spliterator method of the collections returned by all of this class's collection view methods are created from the iterators of the corresponding collections. ...
Serializable,Cloneable,Iterable<E>,Collection<E>,Set<E> public classLinkedHashSet<E>extendsHashSet<E> implementsSet<E>,Cloneable,Serializable Hash table and linked list implementation of theSetinterface, with predictable iteration order. This implementation differs fromHashSetin that it maintains a dou...
This class is a member of theJava Collections Framework. Added in 1.5. Java documentation forjava.util.concurrent.ConcurrentLinkedQueue. Portions of this page are modifications based on work created and shared by theAndroid Open Source Projectand used according to terms described in theCreative Commo...
java.util.concurrent.ConcurrentLinkedDeque has been introduced in Java 7 and is the part of java collection framework. ConcurrentLinkedDeque is an unbounded concurrent deque. ConcurrentLinkedDeque works on the basis of linked nodes. As ConcurrentLinkedDeque is thread safe so removal, insertion and ot...
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org.springframework.transaction.TransactionSystemException: Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction] with root cause java.lang.ClassCastException: java.util.LinkedHashSet cannot be cast to org.hibernate.collection.spi...