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Project 17-2: Convert lengths

Console

Welcome to the Length Converter

1 - Convert a length

2 - Add a type of conversion

3 - Delete a type of conversion

4 - Exit

Enter menu number: 1

1 - Miles to Kilometers: 1.6093

2 - Kilometers to Miles: 0.6214

3 - Inches to Centimeters: 2.54

Enter conversion number: 2

Enter Kilometers: 10

10.0 Kilometers = 6.214 Miles

1 - Convert a length

2 - Add a type of conversion

3 - Delete a type of conversion

4 - Exit

Enter menu number: 2

Enter 'From' unit: Centimeters

Enter 'To' unit: Inches

Enter the conversion ratio: .3937

This entry has been saved.

1 - Convert a length

2 - Add a type of conversion

3 - Delete a type of conversion

4 - Exit

Enter menu number: 1

1 - Miles to Kilometers: 1.6093

2 - Kilometers to Miles: 0.6214

3 - Inches to Centimeters: 2.54

4 - Centimeters to Inches: 0.3937

Enter conversion number: 4

Enter Centimeters: 2.54

2.54 Centimeters = 1 Inches

1 - Convert a length

2 - Add a type of conversion

3 - Delete a type of conversion

4 - Exit

Enter menu number: 4

Goodbye.

Project 17-2: Convert lengths (cont.)

Operation

This application begins by displaying a main menu with four items.

If the user chooses the first main menu item, the application displays a menu of possible conversions. After the user selects a conversion, the application prompts the user to enter a unit of measurement, calculates the conversion, displays the result, and displays the main menu again.

If the user chooses the second main menu item, the application prompts the user to enter the values for a new conversion, saves this new conversion to a file, and displays a message to the user.

If the user chooses the third main menu item, the application displays a menu of possible conversions. After the user selects the conversion, the application deletes that conversion from the file, displays a message to the user, and displays the main menu again.

If the user chooses the fourth main menu item, the application displays a goodbye message and exits.

Specifications

Create a class named Conversion that can store information about a conversion, including the from unit, from value, to unit, to value, and conversion ratio. This class should also contain the methods that perform the conversion calculations and return the results as a formatted string.

Create a class named ConversionIO that contains two methods: one that reads an array list of Conversion objects from a file and another that writes an array list of Conversion objects to a file. For example:

public static ArrayList getConversions()

public static void saveConversions(ArrayList conversions)

Store the list of conversions in a text file named conversion_types.txt in the same directory as the ConversionIO class. If the conversion_types.txt file doesnt exist, the ConversionIO class should create it. This class should use buffered I/O streams, and it should close all I/O streams when theyre no longer needed.

Create a class named ConversionsApp that displays the menus and responds to the users choices.

Use the Console class shown in chapter 8 or a variation of it to get the users entries.

Conversion.java

package Conversion;

import java.text.DecimalFormat;

public class Conversion {

String fromUnit;

String toUnit;

double conversionRatio;

//Creates varibales to store conversion data

public Conversion(String fromUnit, String toUnit, double conversionRatio) {

super();

this.fromUnit = fromUnit;

this.toUnit = toUnit;

this.conversionRatio = conversionRatio;

}

//Displays type of conversion made

public String getType() {

return fromUnit + " To " + toUnit + ":" + conversionRatio;

}

//Calculates conversion and stores as

public String conversionCalc(double fromValue) {

double toValue = fromValue * conversionRatio;

DecimalFormat decFormat = new DecimalFormat("#.##");

toValue = Double.valueOf(decFormat.format(toValue));

return String.valueOf(toValue);

}

}

ConversionIO.java

package Conversion;

import java.util.*;

import java.io.*;

class ConversionIO{

public static ArrayList getConversions(){

ArrayList temp = new ArrayList();

try{

Scanner in = new Scanner(new File("conversion_types.txt"));

String from, to;

double ratio;

while(in.hasNextLine()){

from = in.next();

to = in.next();

ratio = in.nextDouble();

temp.add(new Conversion(from, to, ratio));

}

}

catch(FileNotFoundException e){

System.out.println("conversion_types.txt not found");

}

return temp;

}

public static void saveConversions(ArrayList conversions){

try{

PrintWriter out = new PrintWriter("conversion_types.txt");

for(Conversion item: conversions){

out.println(item.fromUnit+" "+item.toUnit+" "+item.conversionRatio);

}

out.close();

}

catch(FileNotFoundException e){

System.out.println("Unable to create file");

}

}

}

ConversionApp.java

package Conversion;

import java.util.*;

public class ConversionsApp {

public static void main(String args[]) {

ArrayList list = ConversionIO.getConversions();

System.out.println("Welcome to the Length Converter: ");

int choice, i;

Scanner in = new Scanner(System.in);

do {

System.out.println(" 1 - Convert a length");

System.out.println("2 - Add a type of conversion");

System.out.println("3 - Delete a type of conversion");

System.out.println("4 - Exit");

System.out.println("Enter menu number: ");

choice = in.nextInt();

switch (choice) {

case 1:

i = 0;

for (Conversion item : list) {

System.out.println(i + 1 + " - " + item.getType());

i++;

}

int number;

System.out.println("Enter conversion number: ");

number = in.nextInt();

if (number <= list.size()) {

double inp;

System.out.print("Enter " + list.get(number - 1).fromUnit + ": ");

inp = in.nextDouble();

System.out.println(inp + " " + list.get(number - 1).fromUnit + " = "

+ list.get(number - 1).conversionCalc(inp) + " " + list.get(number - 1).toUnit);

} else {

System.out.println("Invalid Conversion");

}

break;

case 2:

String from, to;

double ratio;

System.out.print("Enter 'From' unit: ");

from = in.next();

System.out.print("Enter 'To' unit: ");

to = in.next();

System.out.print("Enter the conversion raio: ");

ratio = in.nextDouble();

list.add(new Conversion(from, to, ratio));

ConversionIO.saveConversions(list);

System.out.println("This entry has been saved");

break;

case 3:

i = 0;

for (Conversion item : list) {

System.out.println(i + 1 + " - " + item.getType());

i++;

}

int n;

System.out.println("Enter conversion number that you want to delete: ");

n = in.nextInt();

if (n <= list.size()) {

list.remove(n - 1);

ConversionIO.saveConversions(list);

System.out.println("Successfully conversion deleted");

} else {

System.out.println("Invalid Conversion");

}

break;

case 4:

System.out.println("Goodbye");

System.exit(1);

default:

System.out.println("Invalid choice");

}

} while (choice != '4');

}

}

Output

debug:

Exception in thread "main" java.util.NoSuchElementException

at java.util.Scanner.throwFor(Scanner.java:862)

at java.util.Scanner.next(Scanner.java:1371)

at Conversion.ConversionIO.getConversions(ConversionIO.java:23)

at Conversion.ConversionsApp.main(ConversionsApp.java:9)

C:\Users ame\AppData\Local\NetBeans\Cache\8.2\executor-snippets\debug.xml:83: Java returned: 1

BUILD FAILED (total time: 0 seconds)