Question: please explain each line of code :-)

public class Driver { public static void main(String[] args) { scanner in = new Scanner(System.in): while(true) { System.out.println("N value: "): int n = in.nextInt(): Pascal pascal = new RecursivePascal(): Stopwatch sw = new Stopwatch(): pascal.printPascal(n): System.out.println(sw.elapsedTime()): pascal = new IterativePasca1(): sw = new Stopwatch(): pascal.printPascal(n): System.out.println(sw.elapsedTime()): pascal = new RecursivePascalHashMap(): sw = new Stopwatch(): pascal.printPascal(n): System.out.println(sw.elapsedTime()): pascal = new RecursivePascalNormal): sw = new Stopwatch(): pascal.printPascal(n): System.out.println(sw.elapsedTime())