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Thursday, 11 June 2015

How to storing Java Object In HashTable

import java.util.Hashtable;
import java.util.Set;

public class HashTableOfObject {

    public static void main(String[] args) {

        Hashtable<Integer,User> ht = new Hashtable<Integer,User>();
       
        ht.put(1,new User("ankush",100));
        ht.put(2,new User("shivam",200));
        ht.put(3,new User("raja", 500));
        ht.put(5,new User("ram",900));
        ht.put(6,new User("ravi",750));

        /*
         * Returns a Set view of the keys contained in this map.
         */
        Set<Integer> keys =ht.keySet();
       
        for (Integer key : keys) {
           
            /*
             * Returns the value to which the
             * specified key is  mapped, or null if
             *  this map contains no mapping for the key.
             */
            User user = ht.get(key);
            System.out.println(" key ="+key+" id ="+user.getId()+" name ="+user.getName());
        }

       
    }
}

class User {
    private String name;
    private int id;

    public User(String name, int id) {
        super();
        this.name = name;
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

}

Output:

 key =6 id =750 name =ravi

 key =5 id =900 name =ram

 key =3 id =500 name =raja

 key =2 id =200 name =shivam

 key =1 id =100 name =ankush

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