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...
packagecom.alpari;importjava.util.ArrayList;importjava.util.Collection;publicclassDemoCollection{publicstaticvoidmain(String[] args){// 创建集合Collectioncollection=newArrayList();// 添加元素collection.add("java"); collection.add("c++"); System.out.println("元素个数 "+collection.size());// 打印:...
*/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...
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...
Java documentation for java.util.TreeSet.TreeSet(java.util.Collection<? extends E>). Portions of this page are modifications based on work created and shared by the Android Open Source Project and used according to terms described in the Creative Commons 2.5 Attribution License. Applies to .NET...
Collection parallelStream, removeIf, stream, toArray Methods declared in interface java.lang.Iterable forEach Methods declared in interface java.util.NavigableSet removeFirst, removeLast, reversed Methods declared in interface java.util.Set containsAll, equals, hashCode, removeAll, retainAll, toArray...
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}, ...
This class is a member of theJava Collections Framework. Added in 1.2. Java documentation forjava.util.TreeSet. 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...
Unlike most other collection types, rather than retrieving a specific element from a set, one typically tests an element for membership in a set. This structed is often used to ensure that no duplicates are present in a container. Implements Container interface. type Set interface { Add(...
Constructs a new tree set containing the elements in the specified collection, sorted according to thenatural orderingof its elements. TreeSet(IComparator) Constructs a new, empty tree set, sorted according to the specified comparator. TreeSet(IntPtr, JniHandleOwnership) ...