java - How to start and end a loop with user input? -

i having trouble figuring out how prompt question allows user enter number or character start or end loop.

the following code

import java.util.scanner;  public class diceroller{     public static void main(string[] args){               scanner keyboard = new scanner(system.in);          int score;         int sum=0;         int roll1 = genraninrange(1, 6);         int roll2 = genraninrange(1, 6);         int roll3 = genraninrange(1, 6);         system.out.println("your rolls were: " + " " + roll1 + " " + roll2 + " " + roll3);                   if (roll1 == roll2 || roll2 == roll3 || roll1 == roll3){ // start of first loop                  system.out.println("you had 2 matching rolls! gain 50 points.");                 score = 50;                 sum += score;                 if (roll1 == roll2 && roll2 == roll3 && roll1 == roll3){ // nested loop                  int rollsum = roll1 + roll2 + roll3;                     if (rollsum == 18){ // nested loop 2                      system.out.println("you had 3 matching 6's! gain 500 points.");                     score = 500;                                             sum += score;                        } // end nested loop 2                  } // end nested loop              } // end of first loop              else {                  system.out.println("sorry, had 0 matching die.");                 score = 1;                 sum -= score;             }                 system.out.println("your score was: " + sum);                 if (sum > 0){                 system.out.println("would continue?");                 }              else{                  system.out.println("you out of points. restart?");                 }      } // end main      public static int genraninrange(int start, int end)     {         return (int)(math.random()*(end-start+1.0)) + start;     } // end genraninrange  } // end dice roller 

this should trick

system.out.print("would continue? y/n: "); string userresp = scanner.nextline(); 

put rest of code in while loop. , have there boolean defined @ beginning true first loop, , compare userresp y or n set boolean.