Trying to get the program to start over if the user enter ('y') after the program completes. [Java]

//here is the code. It complies fine and runs fine. I would like to add a while loop to start from the beginning is the user desires. import java.util.Scanner;

public class Convert {

Scanner scan; int num;

void getVal() {

   int low, high,i,j;

   System.out.println("Enter the low number:");
   scan = new Scanner(System.in);
   low = scan.nextInt();
   System.out.println("Enter the high number:");
   scan = new Scanner(System.in);
   high = scan.nextInt();
   System.out.println("Decimal\tBinary\tOctal\tHexadecimal");
   for (i=low;i<=high;i++){
       System.out.print(i);
       num = i;
       binary_convert();
       oct_convert();
       hex_convert();  
   }
  

}

void hex_convert() {

   String hexa = Integer.toHexString(num);
   int i=0;
   do {
        char letter = hexa.charAt(i);
        System.out.print(letter);
        i++;
           } while (i < hexa.length());
   System.out.println("");

}

void oct_convert() {

   String oct = Integer.toOctalString(num);
   for (int i = 0; i < oct.length(); i++) {
        // Get letters with charAt method.
        char letter = oct.charAt(i);
        System.out.print(letter);
   }
   System.out.print("\t");

}

void binary_convert() { System.out.print("\t"); String bin = Integer.toBinaryString(num); int i=0; while (i < bin.length()) { // Get letters with charAt method. char letter = bin.charAt(i); System.out.print(letter); i++; } System.out.print("\t");

}

public static void main(String args[]) {

   Convert obj = new Convert();
  
   obj.getVal();

System.out.println("Would you like to try again with different numbers? y/n");

} }