2c, Java - rextester

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//'main' method must be in a class 'Rextester'.
//openjdk version '11.0.5' 
//Lokesh reddy 7002
import java.util.*;

class Rextester
{  
   static Scanner in = new Scanner( System.in);
    static int choice;
    public static void main(String args[])
    {
        System.out.println("Welcome to POWERED AIR Customer Service\n How can we help you!\n");
      while (true)
       {
          System.out.println("1.Know my balance\n2.Know my validity date\n3.Know number of free call available\n4.MORE\n5.EXIT\n Please Enter Your Choice:\n");
          choice = in.nextInt();
           switch(choice)
          {
           case 1:
           {
              System.out.println("Your current balance is Rs.0.93");
           break;
           }
           case 2:
           {
              System.out.println("Your current balance is expired in 10/12/2020");
           break;
           }
           case 3:
           {
             System.out.println("You have unlimited calls ");
            break;
           }
            case 4:
           {
              while(true)
              {
             System.out.println("6.Prepaid bill request\n7.Customer Preference\n8.GPRS Activation\n9.Special Message Offers\n10.Special GPRS Offers\n11.3G Activation\n12.Go back to Previous menu\nPlease Enter Your Choice:\n");
              choice=in.nextInt();
               switch(choice)
              {
               case 6:
               {
                 System.out.println(" Ref ID475J8 Your prepaid bill has been generated successfully. You may receive an email in 3 hours or you may Paper bill in 5 days. Please use the following number as password 429AV75\n");
                break;
                }
                case 7:
                {
                  System.out.println("₹448 - 3GB/day+unlimited call - 28 days validity\n₹558 - 3GB/day+unlimited calls - 56 days validity\n₹599 - 2GB/day+unlimited calls - 56 days validity\n₹598 - 1.5GB/Day+unlimited calls - 84 Days validity\nFor more contact to our customer care number\n");
                 break;
                 }
                 case 8:
                 {
                   System.out.println("GPRS Activated Successfully...\n");
                 break;
                 }
                 case 9:
                 {
                   System.out.println("Rs.89 - unlimited messages - 29 days validity\nRs.69 - 0.6rs/message - 29 days validity\nRs.49 - 1rs/message - 15 days validity\n");
                  break;
                  }
                 case 10:
                 {
                   System.out.println("Sorry...... Currently Special GPRS Offers are not available\n");
                  break;
                 }
                 case 11:
                 {
                  System.out.println("3G Activated Successfully.....\n");
                  break;
                 }
                 case 12:
                 {
                   break;
                 }
               }
             }
           }
           case 5:
           {
            System.out.println("Thank You");
            System.exit(0);
           }
          }
         }
    }
}

[ - ] Show input
Compilation time: 1.24 sec, absolute running time: 0.25 sec, cpu time: 0.22 sec, memory peak: 38 Mb, absolute service time: 1,64 sec