Basically, we are not directly using string in Java switch case because Java only permit to use Char and Integer variable directly in switch cases. So, in following example I have explained about how to handle String easily in Java switch case.

First of all possible string values are declared within a enum then in the application using that enum we can handle the string values in the switch case:
Example

public class Test{
 
 public enum Day
 {
     SUNDAY, MONDAY, TUESDAY, WEDNESDAY, 
     THURSDAY, FRIDAY, SATURDAY; 
 }
 public static void main(String args[]) {
  
  String str="SUNDAY";
  
  switch (Day.valueOf(str))
  {
      case MONDAY:  
       System.out.println("Day is Monday");
       break;
       
      case TUESDAY:
       System.out.println("Day is Tuesday");
       break;
       
      case WEDNESDAY:
       System.out.println("Day is Wednesday");
       break;
       
      case THURSDAY:
       System.out.println("Day is Thursday");
       break;
       
      case FRIDAY:
       System.out.println("Day is Friday");
       break;
       
      case SATURDAY:
       System.out.println("Day is Saturday");
       break;
       
      case SUNDAY:
       System.out.println("Day is Sunday");
       break;
  } 
 }
}