(JAVA CODNG )

The question is below the code:

import java.util.*;

public class Homework{

public static void main(String[] args)

{

String name;

String id;

String grade;

double score;

String response;

Scanner a = new Scanner(System.in);

System.out.println("++++++++++++++++++++++++++++++++++");

System.out.println("Welcome to Grading System Program!");

System.out.println("++++++++++++++++++++++++++++++++++");

System.out.println("");

while(response == "YES")

{

System.out.print("Please enter your name (Lastname, Firstname seperated by a comma): ");

name=a.nextLine();

while( !(name.length() >1 &&name.contains((","))==true))

{

System.out.println("");

System.out.print("Please enter your name (Lastname, Firstname seperated by a comma): ");

name=a.nextLine();

}

String nameArr[]=name.split(",");

name=nameArr[1] + " " + nameArr[0];

System.out.println("");

System.out.print("Please enter your ID without any spaces (7 digits): ");

id=a.nextLine();

while(!(id.length()==7))

{

System.out.println("");

System.out.print("Please enter your ID without any spaces (7 digits): ");

id=a.nextLine();

}

System.out.println("");

System.out.print("Please enter your score (0-100) ");

score=a.nextInt();

if(!(score>=0 && score <=100))

{

System.out.println("");

System.out.println("Please enter your score (0-100): ");

score=a.nextInt();

}

System.out.println("");

System.out.println(name +" got "+ score +"!");

if(score >= 80)

{

grade="A";

System.out.println("");

System.out.println("Based on the grading system, " + nameArr[1]+"("+id+") will probably get "+grade+"! Congratulations!");

}

else if(score>=70)

{

grade="B";

System.out.println("");

System.out.println("Based on the grading system, " + nameArr[1]+"("+id+") will probably get "+grade+"! Keep up the good work!");

}

else if(score>=60)

{

grade="C";

System.out.println("");

System.out.println("Based on the grading system, " + nameArr[1]+"("+id+") will probably get "+grade+"! You can do a lot better!");

}

else

{

grade="FNS";

System.out.println("");

System.out.print("Based on the grading system, " + nameArr[1]+"("+id+") will probably get "+grade+"! Please work harder to pass the course!");

}

}

System.out.println("Want to Exit?");

response=a.nextLine();

}

}

Above is the final code, but it has an error. I want to put a response into my output as: Do you want to exit the program? (put YES to terminate).

If the user puts anything other than YES, the code should re-start from "please enter your name".

I have tried doing it with "while" but it gave an error.