StackOfIntegers stack = new StackOfIntegers();

The compiler says it cannot find symbol

public class Prime { public static void main(String[] args) { final int LIMIT = 120; int count = 0; StackOfIntegers stack = new StackOfIntegers(); // Find prime numbers and keep repeating to 120 for (int number = 2; number < LIMIT; number++) if (isPrime(number)) { stack.push(number); // Increase the count count++; } // Print the prime numbers in decreasing order System.out.println("The prime numbers less than 120 are \n"); final int NUMBER_PER_LINE = 10; while (!stack.empty()) { System.out.print(stack.pop() + " "); if (stack.getSize() % NUMBER_PER_LINE == 0) // advance to the new line System.out.println(); } } public static boolean isPrime(int number) { // Assume the number is prime boolean isPrime = true; for (int divisor = 2; divisor <= number / 2; divisor++) { //If true, the number is not prime if (number % divisor == 0) { // Set isPrime to false, if the number is not prime isPrime = false; break; // Exit the for loop } }