Example of Hash Map


Here we write a program which is a simple Hash Map example.

package com.javaforecast4u;
import java.util.*;
public class TestHashMap {

     /**
      * @author:arbind;
      */
     public static void main(String[] args) {
         
          HashMap hm=new HashMap();
          hm.put("empid","1000");
          hm.put("empname","arbind");
          hm.put("email","arbind@gmail.com");
          hm.put("phone",new Integer(1000000));
          System.out.println(hm);

          System.out.println(hm.containsKey("sname"));
          System.out.println(hm.containsKey("xyz"));
          System.out.println(hm.containsValue("9999999"));
          System.out.println(hm.containsValue("muktesh"));
          System.out.println(hm.size());
          System.out.println(hm.isEmpty());

          Collection c=hm.values();
          Iterator i=c.iterator();
          while(i.hasNext())
          {
          System.out.println(i.next());
          }
          System.out.println("........................");
          System.out.println(hm.get("phone"));
          Set s=hm.keySet();
          Iterator i1=s.iterator();
          while(i1.hasNext())
          {
          String key=i1.next().toString();
          String val=hm.get(key).toString();
          System.out.println(""+key+"\t---\t"+val);
          System.out.println(i1.next());
          }

     }

}

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