Java Project: Convert Length, Temperature, and Weight
Java Project - Unit Conversion:
Unit Converter:
Convert between various units (e.g., length, temperature, weight).
A tool that allows users to convert between different units such as length (meters to miles), temperature (Celsius to Fahrenheit), or weight (kilograms to pounds). The user inputs the value and selects the units for conversion.
Input: Value, unit type (e.g., length, weight), and unit to convert to.
Output: Converted value in the target unit.
Example:
- Input: 10 kilometers to miles
- Output: 6.21371 miles
Here are two different solutions for the Unit Converter project in Java, focusing on converting between units of length, temperature, and weight:
Solution 1: Using If-Else Statements
Code:
import java.util.Scanner;
public class UnitConverterIfElse {
public static void main(String[] args) {
// Create a Scanner object to capture user input
Scanner scanner = new Scanner(System.in);
// Input the value to be converted
System.out.print("Enter the value: ");
double value = scanner.nextDouble();
// Input the type of conversion (length, temperature, weight)
System.out.print("Enter the unit type (length, temperature, weight): ");
String unitType = scanner.next().toLowerCase();
// Input the unit to convert from
System.out.print("Enter the unit to convert from (e.g., kilometers, celsius, kilograms): ");
String fromUnit = scanner.next().toLowerCase();
// Input the unit to convert to
System.out.print("Enter the unit to convert to (e.g., miles, fahrenheit, pounds): ");
String toUnit = scanner.next().toLowerCase();
// Variable to store the result
double convertedValue = 0;
// Perform the conversion based on unit type using if-else statements
if (unitType.equals("length")) {
// Length conversion (e.g., kilometers to miles)
if (fromUnit.equals("kilometers") && toUnit.equals("miles")) {
convertedValue = value * 0.621371;
} else if (fromUnit.equals("miles") && toUnit.equals("kilometers")) {
convertedValue = value * 1.60934;
} else {
System.out.println("Invalid length conversion.");
return;
}
} else if (unitType.equals("temperature")) {
// Temperature conversion (e.g., Celsius to Fahrenheit)
if (fromUnit.equals("celsius") && toUnit.equals("fahrenheit")) {
convertedValue = (value * 9/5) + 32;
} else if (fromUnit.equals("fahrenheit") && toUnit.equals("celsius")) {
convertedValue = (value - 32) * 5/9;
} else {
System.out.println("Invalid temperature conversion.");
return;
}
} else if (unitType.equals("weight")) {
// Weight conversion (e.g., kilograms to pounds)
if (fromUnit.equals("kilograms") && toUnit.equals("pounds")) {
convertedValue = value * 2.20462;
} else if (fromUnit.equals("pounds") && toUnit.equals("kilograms")) {
convertedValue = value * 0.453592;
} else {
System.out.println("Invalid weight conversion.");
return;
}
} else {
System.out.println("Invalid unit type.");
return;
}
// Output the converted value
System.out.println("Converted value: " + convertedValue + " " + toUnit);
}
}
Output:
Enter the value: 100 Enter the unit type (length, temperature, weight): length Enter the unit to convert from (e.g., kilometers, celsius, kilograms): kilometers Enter the unit to convert to (e.g., miles, fahrenheit, pounds): pounds Invalid length conversion.
Enter the value: 100 Enter the unit type (length, temperature, weight): weight Enter the unit to convert from (e.g., kilometers, celsius, kilograms): kilograms Enter the unit to convert to (e.g., miles, fahrenheit, pounds): pounds Converted value: 220.462 pounds
Explanation :
- Input: The user inputs a value, a unit type (length, temperature, or weight), and the unit to convert from and to.
- If-Else Structure: Conversions are handled by checking the unit type, and corresponding from-to conversions are implemented.
- Conversion: Specific conversion formulas are applied based on the unit type and units.
- Invalid Inputs: If an invalid conversion is entered, the program outputs an error message.
- Result: The program outputs the converted value in the desired unit.
Solution 2: Using Switch-Case Statements
Code:
import java.util.Scanner;
public class UnitConverterSwitch {
public static void main(String[] args) {
// Create a Scanner object to capture user input
Scanner scanner = new Scanner(System.in);
// Input the value to be converted
System.out.print("Enter the value: ");
double value = scanner.nextDouble();
// Input the type of conversion (length, temperature, weight)
System.out.print("Enter the unit type (length, temperature, weight): ");
String unitType = scanner.next().toLowerCase();
// Input the unit to convert from
System.out.print("Enter the unit to convert from (e.g., kilometers, celsius, kilograms): ");
String fromUnit = scanner.next().toLowerCase();
// Input the unit to convert to
System.out.print("Enter the unit to convert to (e.g., miles, fahrenheit, pounds): ");
String toUnit = scanner.next().toLowerCase();
// Variable to store the result
double convertedValue = 0;
// Switch-case for unit type
switch (unitType) {
case "length":
// Switch-case for length conversion
switch (fromUnit) {
case "kilometers":
if (toUnit.equals("miles")) {
convertedValue = value * 0.621371;
} else {
System.out.println("Invalid length conversion.");
return;
}
break;
case "miles":
if (toUnit.equals("kilometers")) {
convertedValue = value * 1.60934;
} else {
System.out.println("Invalid length conversion.");
return;
}
break;
default:
System.out.println("Invalid unit for length.");
return;
}
break;
case "temperature":
// Switch-case for temperature conversion
switch (fromUnit) {
case "celsius":
if (toUnit.equals("fahrenheit")) {
convertedValue = (value * 9/5) + 32;
} else {
System.out.println("Invalid temperature conversion.");
return;
}
break;
case "fahrenheit":
if (toUnit.equals("celsius")) {
convertedValue = (value - 32) * 5/9;
} else {
System.out.println("Invalid temperature conversion.");
return;
}
break;
default:
System.out.println("Invalid unit for temperature.");
return;
}
break;
case "weight":
// Switch-case for weight conversion
switch (fromUnit) {
case "kilograms":
if (toUnit.equals("pounds")) {
convertedValue = value * 2.20462;
} else {
System.out.println("Invalid weight conversion.");
return;
}
break;
case "pounds":
if (toUnit.equals("kilograms")) {
convertedValue = value * 0.453592;
} else {
System.out.println("Invalid weight conversion.");
return;
}
break;
default:
System.out.println("Invalid unit for weight.");
return;
}
break;
default:
System.out.println("Invalid unit type.");
return;
}
// Output the converted value
System.out.println("Converted value: " + convertedValue + " " + toUnit);
}
}
Output:
Enter the value: 100 Enter the unit type (length, temperature, weight): temperature Enter the unit to convert from (e.g., kilometers, celsius, kilograms): celsius Enter the unit to convert to (e.g., miles, fahrenheit, pounds): fahrenheit Converted value: 212.0 fahrenheit
Enter the value: 100 Enter the unit type (length, temperature, weight): temperature Enter the unit to convert from (e.g., kilometers, celsius, kilograms): kilometers Enter the unit to convert to (e.g., miles, fahrenheit, pounds): miles Invalid unit for temperature.
Explanation:
- Input: The user provides the value, unit type (length, temperature, or weight), and the units to convert between.
- Switch-Case Structure: A switch-case structure is used to handle different types of conversions (length, temperature, weight).
- Nested Switch: Another switch-case block is used to select the correct units for the conversion based on the input.
- Error Handling: The program handles invalid conversions with error messages.
- Result: The converted value is displayed to the user in the specified target unit.
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