Magical Java Puzzle: “Pat The Unicorns”

MagicalLand.java

package io.ehdev;

public class MagicalLand {
    public static void main(String[] args) {

        for (int i = 0; i < (Math.random() * 500) + 2; i++) {
            if (Unicorn.pat()) {
                System.out.println("UNICORN #1: PAT THIS UNICORN ONCE");
            }
        }

        for (int i = 0; i < (Math.random() * 500) + 2; i++) {
            if (Unicorn.pat()) {
                System.out.println("UNICORN #2: PAT THIS UNICORN ONCE");
            }
        }
        System.out.println("END OF PROGRAM");
    }
}

Unicorn.java

package io.ehdev;

public class Unicorn {
    static Integer lineNumber = null;
    public static boolean pat() {
        StackTraceElement[] currentStackTrace = Thread.currentThread().getStackTrace();
        StackTraceElement returnAddress = currentStackTrace[2];

        int currentLineNumber = returnAddress.getLineNumber();

        if(lineNumber == null || currentLineNumber != lineNumber){
            lineNumber = currentLineNumber;
            return true;
        } else {
            return false;
        }
    }
}