Question

A function that takes in as input the colour of a car, and returns the number of cars of that colour present in a file that contains the colour of cars parked in a lot. Create the file, and put in colour of cars (the number of entries doesn't matter, but make sure there is repetition) E.g Blue Red Blue Green Black Red ............. and so on

Answer 1

input.txt

Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red Blue Red Blue Green Black Red

import java.io.File;
import java.io.FileNotFoundException;
import java.util.Scanner;
  
public class CarColour {
  
   //mehtod to count number of cars with color 'col'
   public static int countCars(String col) throws FileNotFoundException
   {
       int count = 0;
       //reading file
       Scanner sc = new Scanner(new File("F://input.txt"));
      
       String data = "";
      
       //reading data from file and appending it to data.
       while(sc.hasNext())
       {
           data = sc.nextLine();
       }
       sc.close();
      
       //extracting all the words from data
       String colors[] = data.split(" ");
      
       //if word is equal to col then increase count.
       for(int i = 0 ; i < colors.length ; i ++)
       {
           if(colors[i].equalsIgnoreCase(col))
               count++;
       }
      
       return count;
   }

   public static void main(String[] args) throws FileNotFoundException {
      
       System.out.println("Number of cars with color: Red==>" + countCars("Red"));
   }

}

Console 3 . :isrrnirnaied C Number of cars with color: arColour [Java Applicatio n ( Pr()43ram liksNaw Red-=>24

If there is anything else you need, then please mention it in the comments section.