java - How can I include in my program that the integers entered must be between 0 and 100? -

the exercise asked me calculate average, maximum, , minimum. code fulfills purpose, need include somewhere in code exam grades entered user must between 0 , 100. best way include this? here code.

import java.util.scanner; import java.io.*; import java.text.decimalformat;   public class hw  { public static void main ( string[] args ) {     int maxgrade = integer.min_value;     int mingrade = integer.max_value;     int count=0;     int total=0;     final int sentinel = -1;     int score;      scanner scan = new scanner( system.in);     system.out.println( "to calculate class average, enter each test        score.");     system.out.println( "when finished, enter -1.");      system.out.print( "enter first test score > ");     score = scan.nextint();       while (score != sentinel )     {         total += score;         count ++;         if( score > maxgrade)             maxgrade = score;         if( score < mingrade)             mingrade = score;          system.out.print("enter next test score > ");         score = scan.nextint();     }     if (count != 0)     {         decimalformat onedecimalplace = new decimalformat("0.0");         system.out.println( "\nthe class average "                  + onedecimalplace.format( (double) (total) / count ));          system.out.println( "the minimum value " + mingrade);         system.out.println( "the maximum value " + maxgrade);     }     else         system.out.println("\nno grades entered");        }      } 

thank you!

create nested loop stop executing once user has met criteria. this:

while (score < 0 || score > 100)   {    system.out.println("please enter number between 0 , 100.");          while(!scan.hasnextint())         {              scan.next();         }       score = scan.nextint();   } 

note code has not been tested, idea of should like.