Read the following code and try to guess what will be its output. import java.util.*; class Car { private int speed; public void setSpeed(int s){ this.speed=s; } public int getSpeed(){ return speed; } } class ChangeSpeedCar extends Thread{ Car car; int step; public ChangeSpeedCar(Car obj,String s,int a){ super(s); this.step=a; this.car=obj; } public void run(){ for(int i=0;i<10000;i++) { int c=car.getSpeed(); c+=step; car.setSpeed(c);} }} public class test { public static void main(String[]args){ Car obj =new Car(); obj.setSpeed(0); ChangeSpeedCar Th1 = new ChangeSpeedCar(obj , "MyThread1",1); ChangeSpeedCar Th2 = new ChangeSpeedCar(obj , "MyThread2",-1); Th1.start(); Th2.start(); try{ Thread.sleep(1000); }catch(Exception e){System.out.print("Error");} System.out.println("The speed of the car is "+obj.getSpeed());}}Output:

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Exercise 1:
1) Read the following code and try to guess what will be its output. import java.util.*;
class Car { private int speed;
public void setSpeed(int s){ this.speed=s; } public int getSpeed(){ return speed; } } class ChangeSpeedCar extends Thread{
Car car; int step;
public ChangeSpeedCar(Car obj,String s,int a){ super(s);
this.step=a;
this.car=obj; }
public void run(){ for(int i=0;i<10000;i++) { int c=car.getSpeed(); c+=step;
car.setSpeed(c);} }}
public class test {
public static void main(String[]args){ Car obj =new Car();
obj.setSpeed(0);
ChangeSpeedCar Th1 = new ChangeSpeedCar(obj , "MyThread1",1); ChangeSpeedCar Th2 = new ChangeSpeedCar(obj , "MyThread2",-1); Th1.start(); Th2.start();
try{
Thread.sleep(1000);
}catch(Exception e){System.out.print("Error");}
System.out.println("The speed of the car is "+obj.getSpeed());}}Output:
2) Write the code and execute it many times. Is the output similar to your previous answer? What’s the issue? How can you modify the code to obtain the expected output? Modify the code and execute it

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