而int java.lang.Object.hashCode()也有具体解释,截取部分如下: Returns a hash code value for the object. This method is supported for the benefit of hashtables such as those provided byjava.util.Hashtable. 其他省略。
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); } }
33 * The iterators returned by this class's iterator method are 34 * fail-fast: if the set is modified at any time after the iterator is 35 * created, in any way except through the iterator's own remove 36 * method, the Iterator throws a {@link ConcurrentModificationException}. 37 *...
created, in any way except through the iterator's ownremovemethod, the Iterator throws aConcurrentModificationException. Thus, in the face of concurrent modification, the iterator fails quickly and cleanly, rather than risking arbitrary, non-deterministic behavior at an undetermined time in the future...
importjava.util.Scanner;publicclassJava01{publicstaticvoidmain(String[]args){// TODO Auto-generated method stubString sex;double height,weight;//定义身高、体重double bmi;//计算保存BMI值Scanner scan=newScanner(System.in);System.out.println("请输入您的性别:");sex=scan.next();System.out.println...
import java.util.HashSet; // Import the HashSet class HashSet<String> cars = new HashSet<String>(); Add ItemsThe HashSet class has many useful methods. For example, to add items to it, use the add() method:Example // Import the HashSet class import java.util.HashSet; public class...
import java.util.Scanner;publicclass Java01 {publicstaticvoid main(String[] args) {// TODO Auto-generated method stubString sex;doubleheight,weight;//定义身高、体重doublebmi;//计算保存BMI值Scanner scan = new Scanner(System.in);System.out.println("请输入您的性别:");sex=scan.next();System....
Modifier and TypeMethodDescription Spliterator<E>spliterator() Creates alate-bindingandfail-fastSpliteratorover the elements in this set. Methods inherited from class java.util.HashSet add,clear,clone,contains,isEmpty,iterator,remove,size Methods inherited from class java.util.AbstractSet ...
Java.Util Assembly: Mono.Android.dll Returns the number of elements in this set (its cardinality). C# [Android.Runtime.Register("size","()I","GetSizeHandler")]publicoverrideintSize(); Returns Int32 the number of elements in this set (its cardinality) ...
Let’s use thesynchronizedSet()method available injava.util.Collectionsto create a thread-safeHashSetinstance: Before using this approach, we need to be aware that it’s less efficient than the ones discussed above. Basically,synchronizedSet()just wraps theSetinstance into a synchronized decorator ...