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...
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...
In this article, we’ll have a look at an integral part of the Java Collections Framework andone of the most popularSetimplementations – theTreeSet. 2. Intro toTreeSet Simply put, theTreeSetis a sorted collection that extends theAbstractSetclass and implements theNavigableSetinterface. Here’...
Exception in thread "main" java.lang.ClassCastException: Bird cannot be cast to java.lang.Comparable at java.util.TreeMap.compare(Unknown Source) at java.util.TreeMap.put(Unknown Source) at java.util.TreeSet.add(Unknown Source) at com.sedion.bysocket.collection.TreeSetTest.main(TreeSe...
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...
public TreeSet(Collection<? extendsE> c) Constructs a new tree set containing the elements in the specified collection, sorted according to thenatural orderingof its elements. All elements inserted into the set must implement theComparableinterface. Furthermore, all such elements must bemutually comp...
Exception in thread "main" java.lang.ClassCastException: com.frank.chapter22.TreeSetTest$Goods cannot be cast to java.lang.Comparable [Goods{name='Iphone4S', price=500.0}, Goods{name='Iphone5', price=800.0}, Goods{name='Iphone6S', price=2500.0}, Goods{name='Iphone7S', price=4500.0}, ...
Set接口也是Collection的子接口,Set接口没有提供额外的方法。Set集合支持的遍历方式也和Collection集合一样,使用foreach和Iterator遍历。 别团等shy哥发育 2023/02/25 6180 Java内功心法,Set集合的详解 编程算法存储 Set:注重独一无二的性质,该体系集合可以知道某物是否已近存在于集合中,不会存储重复的...
JavaFinalize() Called by the garbage collector on an object when garbage collection determines that there are no more references to the object. (Inherited from Object) Last() Returns the last element in this set. Lower(Object) Added in 1. Notify() Wakes up a single thread that is wai...
Java.Util.Concurrent.Locks Java.Util.Functions Java.Util.Jar Java.Util.Logging Java.Util.Prefs Java.Util.Regex Java.Util.Streams Java.Util.Zip Javax.Annotation.Processing Javax.Crypto Javax.Crypto.Interfaces Javax.Crypto.Spec Javax.Microedition.Khronos.Egl ...