Create A Program to Create Car Warm Up System in Java Assignment Solution

Instructions

Objective

Write a java assignment program to create car warm up system.

Requirements and Specifications

Source Code

import java.io.BufferedReader; import java.io.BufferedWriter; import java.io.FileNotFoundException; import java.io.FileReader; import java.io.FileWriter; import java.io.IOException; import java.util.Scanner; public class App { // Method to ask user for model public static String getModel(Scanner sc) { System.out.print("Enter model: "); return sc.nextLine(); } // Method to ask for car's release year public static int getReleaseYear(Scanner sc) { // We want to validate that the user enters an integer and not a string, so we use a try-catch block // We also use a while-loop so if user enters an invalid input, the function will ask again while(true) { try{ System.out.print("Enter release year: "); int year = Integer.valueOf(sc.nextLine()); if(year > 0) // is positive { return year; } else { System.out.println("The release year must be positive."); } } catch(Exception ex) { // The only way to get an exception is if the Integer.valueOf function fails, and that happens // when the user enters an non-numeric input System.out.println("Please enter a valid release year."); } } } // Method to ask for car's trim public static String getTrim(Scanner sc) { System.out.print("Enter car's trim: "); return sc.nextLine().strip(); } // Method to ask for type of car public static String getType(Scanner sc) { // Define an Array with the valid types String[] valid_types = {"truck", "sedan", "coupe", "station wagon", "van"}; // We use a while-loop so if user enters an invalid input, the function will ask again while(true) { System.out.print("Enter car type: "); String car_type = sc.nextLine().strip().toLowerCase(); // Check if the car_type is in the arra valid_types boolean valid = false; for(String s: valid_types) { if(s.compareTo(car_type) == 0) { valid = true; break; } } if(valid) { return car_type; } else { System.out.println("Please enter a valid car type."); } } } // Method to get MPG public static int getMPG(Scanner sc) { // We want to validate that the user enters an integer and not a string, so we use a try-catch block // We also use a while-loop so if user enters an invalid input, the function will ask again while(true) { try{ System.out.print("Enter MPG: "); int mpg = Integer.valueOf(sc.nextLine().strip()); if(mpg > 0) // is positive { return mpg; } else { System.out.println("The miles-per-gallon value must be positive."); } } catch(Exception ex) { // The only way to get an exception is if the Integer.valueOf function fails, and that happens // when the user enters an non-numeric input System.out.println("Please enter a valid release MPG value."); } } } /* ************************ ****** PART 2 ********** ************************ */ public static String summarizeInfo(String model, int release_year, String trim, String car_type, int mpg) { /* This function takes all car's info and returns it all in a single string */ return String.format("Model: %s\nRelease Year: %d\nTrim: %s\nType: %s\nMiles-per-gallon: %d\n", model, release_year, trim, car_type, mpg); } public static void saveCarInfo(String info) throws IOException { /* This function saves the car info into a file named 'car.txt' */ // use a try-catch block try { BufferedWriter writer = new BufferedWriter(new FileWriter("car.txt")); writer.write(info); writer.close(); } catch(IOException ex) { System.out.println("Could not write info to file car.txt"); } } public static void readCarInfo() { /* This function reads the car info into from file named 'car.txt' */ try { BufferedReader reader = new BufferedReader(new FileReader("car.txt")); String line; while((line = reader.readLine()) != null) // while there is a line to be read { System.out.println(line); } reader.close(); } catch(IOException ex) { System.out.println("Could not read info from file car.txt"); } } public static void main(String[] args) throws Exception { // First, create Scanner Scanner sc = new Scanner(System.in); // Ask for model String model = getModel(sc); // Ask for release year int year = getReleaseYear(sc); // Ask for trim String trim = getTrim(sc); // Type String car_type = getType(sc); //get MPG int mpg = getMPG(sc); // Now, print info String info = summarizeInfo(model, year, trim, car_type, mpg); // Save to file saveCarInfo(info); // read from file readCarInfo(); // Close scanner sc.close(); } }