Java Program on Map Interface Methods

Program 1

package dataflair;
import java.util.*;
public class TestMap1 
{
        public static void main(String[] args) 
        {
             Map<Integer,String> M=new HashMap<Integer,String>();
             
              System.out.println(M.size());
             M.put(1, "Limca");
             M.put(3, "Water");
             M.put(5, "Frooti");
             M.put(2, "Limca");
             M.put(7, "Frooti");
             M.put(4, "Limca");
             M.put(6, "Water One Plus");
             System.out.println(M);
            //  System.out.println(M.size());
              
            // Map<Integer,String> M1=new HashMap<Integer,String>();
             //M1.putAll(M);
            
//             System.out.println("Before Replace" + M);
//             M.replace(3,"Water","ABCDE");
//             System.out.println("After Replace" + M);
            
//               System.out.println("Before Remove" + M);
//               System.out.println(M.remove(3));
//               System.out.println("After Remove" + M);
//                 System.out.println("Before Remove" + M);
//                 M.remove(2, "Water");
//                System.out.println("After Remove" + M); 
                //System.out.println(M.isEmpty());
                 //M.clear();
                 
//                 if(M.containsValue("ABCDE"))
//                    System.out.println("Searching success");
//                else
//                    System.out.println("Searching not success");
//                             if(M.containsKey(39))
//                              System.out.println("Searching success");
//                            else
//                             System.out.println("Searching not success");    
                       //System.out.println(M.get(6));
                      
        }
}