Validation Process

Question

I have a java code that is calculating the marks of students and giving them there average. I just cant seem to make a validation process run. I need it to allow them to only enter in a number between 1-100, and no letters. this is what i have in the way of code, if you could help me work a validation process to do that into it. thx
import java.awt.*;
import hsa.Console;
public class ASMT11_LemireE
static Console c; // The output console
public static void main (String[] args)
c = new Console (); //'c' is the output console
// Place your program here:
// Place your program here:
//Identifiers
String name;
String mark1;
String mark2;
String mark3;
String mark4;
//Name of student
c.setTextColor(Color.red);
c.print("Please Enter Full Name:");
c.setTextColor(Color.blue);
name = c.readLine ();
//First Term Marks
c.setTextColor(Color.green);
c.println("First Term Marks:");
//Mark 1
c.setTextColor(Color.red);
c.print("Please enter mark for first course:"); //Question
c.setTextColor(Color.blue);
mark1 = c.readLine (); //response
//Mark 2
c.setTextColor(Color.red);
c.print("Please enter mark for second coruse:");
c.setTextColor(Color.blue);
mark2 = c.readLine ();
//Mark 3
c.setTextColor(Color.red);
c.print ("Please enter mark for third course:");
c.setTextColor(Color.blue);
mark3 = c.readLine ();
//Mark 4
c.setTextColor(Color.red);
c.print ("Please enter mark for fourth course:");
c.setTextColor(Color.blue);
mark4 = c.readLine ();
//Clear the screen
c.setTextColor(Color.green);
c.println("Press any key to see the marks you got");
c.getChar();
c.clear();
//System.out.println("This is the second page");
//Show marks
c.setTextColor(Color.green);
c.println("These are your marks:");
//Print Marks
c.setColor (Color.blue);
c.drawString ("First Course:" + mark1, 10, 40);
c.drawString ("Second Course:" + mark2, 10, 60);
c.drawString ("Third Course:" + mark3, 10, 80);
c.drawString ("Fourth Course:" + mark4, 10, 100);

Answer 1

do{
   //Mark 1
  c.setTextColor(Color.red);
  c.print("Please enter mark for first course:"); //Question
  c.setTextColor(Color.blue);
  mark1 = c.readLine (); //response
}while(!checkMark(mark1));and
public static boolean checkMark(String mark) {
          try {
               int m = Integer.parseInt(mark);
               if (m < 1 || m > 100) {
                    return false;
          } catch (NumberFormatException e) {
               return false;
          return true;
}