How to check for key in a Map irrespective of the case? [duplicate]

Answer 1

create your own wrapper of string class, implement equals and hashcode, use this as the key in the hashmap:

   class MyStringKey
   {
      private String string;
      public String getString()
      {
         return string;
      }
      public void setString(String string)
      {
         this.string = string;
      }

      public boolean equals(Object o)
      {
         return o instanceof MyStringKey && this.equalsIgnoreCase(((MyStringKey)o).getString());
      }

      public boolean hashCode()
      {
         return string.toLowerCase().hashcode(); //STRING and string may not have same hashcode
      }
   }