importjava.util.*;publicclassHashTableDemo{publicstaticvoidmain(Stringargs[]){// Create a hash mapHashtablebalance=newHashtable();Enumerationnames;Stringstr;doublebal;balance.put("Zara",newDouble(3434.34));balance.put("Mahnaz",newDouble(123.22));balance.put("Ayan",newDouble(1378.00));balance.p...
int size() : It returns the number of entries in the hash table. 5. Hashtable Example Let’s see a example for how to use Hashtable in java programs. import java.util.Hashtable; import java.util.Iterator; public class HashtableExample { public static void main(String[] args) { /...
代码语言:java AI代码解释 packagecom.example.javase.collection;importjava.util.Hashtable;/** * @author ms * @date 2023/10/25 16:26 */publicclassHashtableTest{publicstaticvoidmain(String[]args){Hashtable<String,Integer>map=newHashtable<>();map.put("a",1);map.put("b",2);map.put("c...
*@see#get(Object)*/publicsynchronizedV put(K key, V value) {//Make sure the value is not nullif(value ==null) {thrownewNullPointerException(); }//Makes sure the key is not already in the hashtable.Entry tab[] =table;inthash =key.hashCode();intindex = (hash & 0x7FFFFFFF) %tab...
我们知道在Java中最常用的两种结构是数组和模拟指针(引用),几乎所有的数据结构都可以利用这两种来组合实现,HashMap也是如此。实际上HashMap是一个“链表散列”,如下是它的数据结构: HashMap数据结构图 下图的table数组的每个格子都是一个桶。负载因子就是map中的元素占用的容量百分比。比如负载因子是0.75,初始容量(桶...
=null) {27s.writeObject(entryStack.key);28s.writeObject(entryStack.value);29entryStack =entryStack.next;30}31}3233privatevoidreadObject(java.io.ObjectInputStream s)34throwsIOException, ClassNotFoundException35{36//Read in the threshold and loadFactor37s.defaultReadObject();3839//Validate load...
public class HashTableDemo { public static void main(String[] args) { //创建哈希表 HashTable hashTable = new HashTable(); //菜单 String select = ""; Scanner scanner = new Scanner(System.in); while (true) { System.out.println("add:添加节点"); ...
As of the Java 2 platform v1.2, this class was retrofitted to implement theMapinterface, making it a member of the Java Collections Framework. Unlike the new collection implementations,Hashtableis synchronized. If a thread-safe implementation is not needed, it is recommended to useHashMapin plac...
Hashtable是一个遗留类,不是最初的Java集合框架的一部分(后来在JDK 1.2中包括了它)。HashMap从一开始就是集合的一部分。还要注意的是,Hashtable扩展了Dictionary类,正如Javadocs所述,这是过时的,并已在较新的JDK版本中被Map接口所取代。 //HashTable定义 ...
HashMap和Hashtable都是Map接口的典型实现类,他们之间的关系完全类似于ArrayList和Vector的关系:Hashtable是一个古老的Map实现类,它从JDK1.0起就已经出现了,当它出现时,Java没有提供Map接口,所以它包含了两个繁琐的方法:elements()(类似于Map接口定义的values()方法)和keys(类似于Map接口定义的keySet()方法),现在很...