How to use a string in switch case?

Source:

public class StringSwitch {

   public static void main(String[] args) {

      String str = "def";

      switch (str) {
         case "abc" : System.out.println("String case: abc");
                      break;
         case "def" : System.out.println("String case: def");
                      break;
         default:     System.out.println("Invalid String case");
      };

   }
}

Output:

   $ java StringSwitch 
   String case: def