Understanding Maps

package edu.scjp.maps;

import java.util.HashMap;

import java.util.Map;

public class MapProgram {

     

      public static void main(String args[]) {

           

            Map credentials = new HashMap();

           

            credentials.put("a160097", "sridhariyer");

            credentials.put("a160093", "sridhariyer");

            credentials.put("a160092", "sridhariyer");

            credentials.put("a160091", "sridhariyer");

            credentials.put("a160097", "sridhariyer");           

           

            System.out.println(credentials.keySet());

           

            System.out.println(credentials.entrySet());

           

            for (String key : credentials.keySet()) {

                  System.out.println("Values: "+ credentials.get(key));

            }

           

            System.out.println(credentials.hashCode());

           

           

      }

}

Output:

[a160091, a160093, a160097, a160092]
[a160091=sridhariyer, a160093=sridhariyer, a160097=sridhariyer, a160092=sridhariyer]
Values: sridhariyer
Values: sridhariyer
Values: sridhariyer
Values: sridhariyer
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