Java unit converter help?

Does anyone know how to make a unit converter with java using if, else, else if; .equals?



For example:

2.0 miles equals:

321868.8 centimeters

3218.688 meters

3.218688 kilometers

Java unit converter help?
I would pick a base unit to start. Then I would convert the entered number to the base unit and then to the desired one. For example, lets say you choose meters as the base unit.



First, I would define several constants to convert to meters.



static double KILOMETERS = 0.001;

static double CENTIMETERS = 100;

static double MILES = 0.00062;

static double INCHES = 39.37;



Then, declare the variables.



String start_type , end_type;

double start_value , base_value, end_value;



After storing the type of conversion, I would put the if-else statements to convert to the base.



if(start=="miles") {

base_value = MILES*start_value;

}

else if(start=="centimeters") {

base_value = CENTIMETERS*start_value;

}

...



Finally, put the if-else statements to convert to the end type.



if(end=="miles") {

end_value = 1/MILES * base_value;

}

else if(end=="centimeters") {

end_value = 1/CENTIMETERS * base_value;

}

...





Hope this helps. Good Luck.