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/* Simple Java Hashtable example This simple Java Example shows how to use Java Hashtable. It also describes how to add something to Hashtable and how to retrieve the value added from Hashtable. */ import java.util.Hashtable; public class SimpleHashtableExample { public static void main(String[] args) { //create object of Hashtable Hashtable ht = new Hashtable(); /* Add key value pair to Hashtable using Object put(Object key, Object value) method of Java Hashtable class, where key and value both are objects and can not be null. put method returns Object which is either the value previously tied to the key or null if no value mapped to the key. */ ht.put("One", new Integer(1)); ht.put("Two", new Integer(2)); /* Please note that put method accepts Objects. Java Primitive values CAN NOT be added directly to Hashtable. It must be converted to corrosponding wrapper class first. */ //retrieve value using Object get(Object key) method of Java Hashtable class Object obj = ht.get("One"); System.out.println(obj); /* Please note that the return type of get method is Object. The value must be casted to the original class. */ } } /* Output of the program would be 1 */ |
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