All in Java Please

Q1: Concurrent output (textbook Programming exercises 32.1)

Rewrite the example multithreading program below to display output in a text area, as shown in the sample output.

public class TaskThreadDemo { public static void main(String[] args) { Runnable printA = new PrintChar('a', 100); Runnable printB = new PrintChar('b', 100); Runnable print100 = new PrintNum(100); Thread thread1 = new Thread(printA); Thread thread2 = new Thread(printB); Thread thread3 = new Thread(print100); thread1.start(); thread2.start(); thread3.start(); } } class PrintChar implements Runnable { private char charToPrint; private int times; public PrintChar(char c, int t) { charToPrint = c; times = t; } @Override public void run() { for (int i = 0; i < times; i++) { System.out.print(charToPrint); } } } class PrintNum implements Runnable { private int lastNum; public PrintNum(int n) { lastNum = n; } @Override public void run() { for (int i = 1; i <= lastNum; i++) { System.out.print(" " + i); } } }

Sample output

Note: your output could be different

Hint: use keyword synchronized to protect the text area when a thread is trying to update it.

Extra credit (10%) Rewrite Q1 with thread pool.

Sample output

Note: your output could be different