In this program you will see, way to convert one length measuring unit to another unit.Generally such type of questions asked to check programming logics.

See Also : Java Program : Convert time hour minute and seconds

Example

import java.util.Scanner;

public class UnitConversionCalculator {

	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);

	      System.out.println("Convert from:");
	      String fromUnit = in.nextLine();
	      UnitConverter from = new UnitConverter(fromUnit);

	      System.out.println("Convert to: ");
	      String toUnit = in.nextLine();
	      UnitConverter to = new UnitConverter(toUnit);

	      System.out.println("Value:");
	      double val = in.nextDouble();
	      //convert to meter
	      double meters = from.toMeters(val);
          //convert meter to required unit
	      double converted = to.fromMeters(meters);

	      System.out.println(val + " " + fromUnit + " = " + converted + " " + toUnit);
	}

}


That is main class for unit conversion for length measurement.
public class UnitConverter {
	static double INCHES = 39.37;
	static double FEET = 3.28;
	static double MILES = 0.00062;
	static double MILLIMETERS = 1000;
	static double CENTIMETERS = 100;
	static double METERS = 1;
	static double KILOMETERS = 0.001;

	private double meters, converted;

	String fromUnit, toUnit;

	public UnitConverter(String afromUnit) {
		fromUnit = afromUnit;
		toUnit = afromUnit;
	}

	// method to convert given value to meter
	public double toMeters(double val) {
		if (toUnit.equals("in")) {
			meters = (val / INCHES);
		} else if (toUnit.equals("ft")) {
			meters = (val / FEET);
		} else if (toUnit.equals("mi")) {
			meters = (val / MILES);
		} else if (toUnit.equals("mm")) {
			meters = (val / MILLIMETERS);
		} else if (toUnit.equals("cm")) {
			meters = (val/ CENTIMETERS);
		} else if (toUnit.equals("m")) {
			meters = (val / METERS);
		} else {
			meters = (val / KILOMETERS);
		}
		return meters;
	}

	// method to convert meter to required unit
	public double fromMeters(double meters) {
		if (fromUnit.equals("in")) {
			converted = Math.round(INCHES * 100 * meters);
		} else if (fromUnit.equals("ft")) {
			converted = Math.round(FEET * 100 * meters);
		} else if (fromUnit.equals("mi")) {
			converted = Math.round(MILES * 100 * meters);
		} else if (fromUnit.equals("mm")) {
			converted = Math.round(MILLIMETERS * 100 * meters);
		} else if (fromUnit.equals("cm")) {
			converted = Math.round(CENTIMETERS * meters);
		} else if (fromUnit.equals("m")) {
			converted = Math.round(METERS * meters);
		} else {
			converted = Math.round(KILOMETERS * meters);
		}
		return converted;
	}
}

Output

Convert from:
m
Convert to: 
cm
Value:
1
1.0 m = 100.0 cm

		

		
		
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