1. (20 pts) For the following program, explain the interesting elements related to threads 1 public class TaskThreadDemo( 2 public static void main (String args I) ( 3 String D sa ("a","X""" 4 for (String s:sa) Rnnable ps new PrintChar (s, 200); 6 Thread ts new Thread (ps, s); ts start ( 8 /end for each character 9// end main 10)//end class Task ThreadDemo 2 class PrintChar implements Runnable 13 String ch 14 int times; 15 16 public PrintChar (String c, int n) 17 ch 18 times n 19)//end constructor 20 21 public void run ) 22 for (int i 0; i