How to handle String in switch case of JAVA

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;
  }
 }
}

Demonstration of switch statement in java

public class Test {

   public static void main(String args[]){
      char grade = args[0].charAt(0);

      switch(grade)
      {
         case 'A' :
            System.out.println("Excellent!"); 
            break;
         case 'B' :
         case 'C' :
            System.out.println("Well done");
            break;
         case 'D' :
            System.out.println("You passed");
         case 'F' :
            System.out.println("Better try again");
            break;
         default :
            System.out.println("Invalid grade");
      }
      System.out.println("Your grade is " + grade);
   }
}