Question

Predict the output from the following program. Select all lines of output that are produced by this program. If there are computed values in an output line, you must select the line with the correct value as computed by the program.

public class WalkToSchool20 {

        public static void main (String[] args) {

                Pedestrian p1 = new Pedestrian ( 1 );

                Pedestrian p2 = new Pedestrian ( 2 );

                Pedestrian p3 = new Pedestrian ( 3 );

                p1.start();

                p2.start();

                p3.start();

                p2.walk (64);

                p3.walk (16);

                p1.walk (8);

                p3.getTicket (45);

                p2.takeDetour ();

                p3.takeDetour ();

                p2.getTicket (128);

                p1.walk (4);

                p2.walk (16);

                p3.walk (96);

                p2.walk (14);

                p1.interrupt ();

                p1.walk (75);

                p3.stopWalking();

                p2.stopWalking();

                p1.stopWalking();

                try {

                        p1.join();

                        p2.join();

                        p3.join();

                }

                catch (InterruptedException e) {}

                System.out.println("Total time = " +

                        (p1.gettime() + p2.gettime() + p3.gettime()));

        }

} // WalkToSchool20  

class Pedestrian extends Thread {

        private static final int DETOUR_DELAY = 48;

        private int id;

        private int time;

        private boolean walking;

        Pedestrian (int id) {

                this.id = id;

                this.time = 0;

                this.walking = true;

        }

        public void walk (int t) {

                time = time + id*t;

        }

        public void takeDetour () {

                time = time + id * DETOUR_DELAY;

        }

        public void stopWalking () {

                walking = false;

        }

        public void getTicket (int t) {

                time = time + t;

        }

        public int gettime () {

                return time;

        }

        public void run () {

                while (walking) {

                        Thread.yield();

                }

                if (interrupted())

                        System.out.println ("Pedestrian " + id +

                                ": did not complete the trip");

                else

                        System.out.println ("Pedestrian " + id +

                                ": walking time = " + time);

        }

} // Pedestrian

Question 6 options:

	Pedestrian 3: did not complete the trip
	Pedestrian 2: walking time = 384
	Pedestrian 3: walking time = 525
	Pedestrian 1: did not complete the trip
	Pedestrian 2: walking time = 412
	Pedestrian 3: walking time = 445
	Pedestrian 2: did not complete the trip
	Total time = 1024
	Total time = 841

Please help due within 30 mins

Answer 1

The output will be

Pedestrian 3: walking time = 525

Pedestrian 1: did not complete the trip

Pedestrian 2: walking time = 412

Total time = 1024

because for p1 in the program we have p1.interrupt()This will be the output for the given program

when we have interrupt we are just displaying that the pedestrain did not complete the trip

remaining pedestrain 2 and 3 completes within 412 and 525

the order may be changed because of threads

i.e. pedestrain order will be changed because of parallel running of threads

but the time will be same

hope this is helpful

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