In java 8. Modify the averageTopSpeed() method (in the class FormulaOne) using only lambdas and streams...
In java 8. Modify the averageTopSpeed() method (in the class FormulaOne) using only lambdas and streams and print it to the terminal via the driver class:
import java.util.*;
public class Racer implements Comparable
{
private final String name;
private final int year;
private final int topSpeed;
public Racer(String name, int year, int topSpeed){
this.name = name;
this.year = year;
this.topSpeed = topSpeed;
}
public String toString(){
return name + "-" + year + ", Top speed: " + topSpeed +
"km/h";
}
public int getTopSpeed(){
return topSpeed;
}
public int getYear(){
return year;
}
public String getName(){
return name;
}
public int compareTo(Racer other){
if(year != other.getYear()){
return year - other.getYear();
}
return name.compareTo(other.getName());
}
}
public class FormulaOne
{
private String name;
private ArrayList racers;
public FormulaOne(String name){
this.name = name;
racers = new ArrayList();
}
public void add(Racer r){
racers.add(r);
}
public int averageTopSpeed(){
int sumTop = 0;
int sumIt = 0;
for(Racer r: racers){
sumTop += r.getTopSpeed();
sumIt++;
}
int avgTop = sumTop/sumIt;
return avgTop;
}
public Racer fastestRacer(){
Racer fastest = null;
for(Racer r: racers){
if(fastest == null || fastest.getTopSpeed() <
r.getTopSpeed()){
fastest = r;
}
}
return fastest;
}
public void printFormulaOne(){
System.out.println(name);
Collections.sort(racers);
for(Racer r: racers){
System.out.println(r);
}
}
}
public class Driver
{
public static void exam(){
Racer r1 = new Racer("Farrari", 2011, 180);
Racer r2 = new Racer("Lada", 2016, 320);
Racer r3 = new Racer("Volvo" , 2020, 180);
Racer r4 = new Racer("Fiat" , 2016, 250);
Racer r5 = new Racer("Toyota", 2000, 160);
System.out.println(r1.toString());
System.out.println(r2.toString());
System.out.println(r3.toString());
System.out.println(r4.toString());
System.out.println(r5.toString());
FormulaOne fo = new FormulaOne("Formula One");
fo.add(r1);
fo.add(r2);
fo.add(r3);
fo.add(r4);
fo.add(r5);
System.out.println("");
System.out.println("Find average topspeed of cars in Formula One:
");
System.out.println(averageTopSpeed() + "km/h");
System.out.println("");
System.out.println("Find fastest car in Formula One");
System.out.println(fo.fastestRacer());
System.out.println("");
System.out.println("Alle racerbiler i Formula One sorteres efter
produktions år");
fo.printFormulaOne();
}
}
Homework Answers
Code : i have only modified the averageTopSpeed() method (in the class FormulaOne) using only lambdas and streams as asked in question and printed the output by using Driver mehtod of the Driver class. Changed the name of method in Driver class to test() as HomeworkLib editor is giving error for that input.
import java.util.*;
import java.util.stream.Collectors;
class Racer implements Comparable
{
private final String name;
private final int year;
private final int topSpeed;
public Racer(String name, int year, int topSpeed){
this.name = name;
this.year = year;
this.topSpeed = topSpeed;
}
public String toString(){
return name + "-" + year + ", Top speed: " + topSpeed + "km/h";
}
public int getTopSpeed(){
return topSpeed;
}
public int getYear(){
return year;
}
public String getName(){
return name;
}
public int compareTo(Object o) {
return 0;
}
public int compareTo(Racer other){
if(year != other.getYear()){
return year - other.getYear();
}
return name.compareTo(other.getName());
}
}
class FormulaOne
{
private String name;
private List<Racer> racers;
public FormulaOne(String name){
this.name = name;
racers = new ArrayList();
}
public void add(Racer r){
racers.add(r);
}
public int averageTopSpeed(){
//modifying with java 8 lambda expression
/* here we are taking the racers list element one by one by using .stream() */
/* after stream conversion we are using .collect() to collect the output of the list*/
/* in .collect as paramter we calculate the avergae of the list top speed by using
* Collectors .averagingInt method having the TopSpeed of every list element as parameter one by one
* .avergingInt() basically sum all the speed and calculate average from it*/
Double averageSpeed = racers
.stream()
.collect(Collectors.averagingInt(p -> p.getTopSpeed()));
return averageSpeed.intValue(); /*output is in Double by out method output is int so
converting the same*/
}
public Racer fastestRacer(){
Racer fastest = null;
for(Racer r: racers){
if(fastest == null || fastest.getTopSpeed() < r.getTopSpeed()){
fastest = r;
}
}
return fastest;
}
public void printFormulaOne(){
System.out.println(name);
Collections.sort(racers);
for(Racer r: racers){
System.out.println(r);
}
}
}
class Driver
{
public static void test(){
Racer r1 = new Racer("Farrari", 2011, 180);
Racer r2 = new Racer("Lada", 2016, 320);
Racer r3 = new Racer("Volvo" , 2020, 180);
Racer r4 = new Racer("Fiat" , 2016, 250);
Racer r5 = new Racer("Toyota", 2000, 160);
System.out.println(r1.toString());
System.out.println(r2.toString());
System.out.println(r3.toString());
System.out.println(r4.toString());
System.out.println(r5.toString());
FormulaOne fo = new FormulaOne("Formula One");
fo.add(r1);
fo.add(r2);
fo.add(r3);
fo.add(r4);
fo.add(r5);
System.out.println("");
System.out.println("Find average topspeed of cars in Formula One: ");
System.out.println(fo.averageTopSpeed() + "km/h"); // this will print the average of top speed
System.out.println("");
System.out.println("Find fastest car in Formula One");
System.out.println(fo.fastestRacer()); //this print the fastest car
System.out.println("");
System.out.println("Alle racerbiler i Formula One sorteres efter produktions år");
fo.printFormulaOne(); //this print all formula one
}
public static void main(String a[]){
test(); /* this call the test method of driver to print the speed,average speed, fastest speed */
}
}
OutPut :-
The averge speed output is highlighted
Main changes in code :-
import statement
average speed:-
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