编辑代码

import java.util.*;

public class CollectionsDemo {

   public static void main(String[] args) {
      Map m1 = new HashMap(); 
      m1.put("Zara", 8);
      m1.put("Mahnaz", 31);
      m1.put("Ayan", 12);
      m1.put("Daisy", 14);
      System.out.println();
      if(m1.containsKey("Zara"))
      {
          m1.put("Zara",(int)m1.get("Zara")+1);
      }
      System.out.println(" Map Elements");
      System.out.print("\t" + m1);
   }
}