How to rewrite 'for' loops to do the same thing only using 'while' loops. It should produce same output as below. Java

public class nestedFor7 { public static void main(String[] args) { int row = 4, counter = 2; for (int i = row; i > 0; i--){ for (int j = i+1; j > 1; j--){ if (i % 3 == 2){ System.out.print("7"); counter = counter + 1; } else System.out.print("1"); } System.out.println(); } System.out.println(counter); } }