Is my Java math THAT bad?

[Benchamoneh]

I've been learning to use Java and have gotten as far as writing a simple application for a unit converter, however the end values are all wrong! I've heard that Java is bad a maths so I'm just wondering, is this bad logic on my part or Java? How would I go about fixing it? I've attached the code as well as copying it out here:

import java.util.Scanner;

public class converter {

public static void main(String[] args) {

// Values of different distance units. Base value is METERS
final double MILLIMETERS = 1000;
final double CENTIMETERS = 100;
final double METERS = 1;
final double KILOMETERS = 0.001;

// Values submitted by the user
double valueIn;
int unitType;

// Used in calculation
double baseValue;
double[] valueOut = new double[4];

// Take input from user
Scanner sc = new Scanner(System.in);

// Get the unit type from user
System.out.print("Enter the base unit type:\n"+
" 1. Millimeters\n"+
" 2. Centimeters\n"+
" 3. Meters\n"+
" 4. Kilometers\n"+
"Your selection (int): ");
try {
unitType = sc.nextInt();
} catch (Exception e) {
System.out.println("Unrecognised int, set to millimeters.");
unitType = 1;
}


// Get the unit amount from user
System.out.print("Enter the unit amount: ");
try {
valueIn = sc.nextDouble();
} catch (Exception e) {
System.out.println("Unrecognised double, set to 1.");
valueIn = 1;
}


// Get the converted values (provided the valueIn is valid)
if(valueIn != 0) {
baseValue = 0;

// Convert valueIn to METERS based on which value specified
if (unitType==1) {
baseValue = MILLIMETERS / valueIn;
} else if (unitType==2) {
baseValue = CENTIMETERS / valueIn;
} else if (unitType==3) {
baseValue = METERS / valueIn;
} else if (unitType==4) {
baseValue = KILOMETERS / valueIn;
} else {
System.out.println("Could not detect unit type:"+unitType);
}

//
valueOut[0] = MILLIMETERS * baseValue;
valueOut[1] = CENTIMETERS * baseValue;
valueOut[2] = METERS * baseValue;
valueOut[3] = KILOMETERS * baseValue;

// If valueIn was 0
} else {
// Set all values to 0
for (int i=0; i<valueOut.length; i++) {
valueOut[i] = 0;
}
}

// Output the converted values
System.out.println("Millimeters value: "+valueOut[0]);
System.out.println("Centimeters value: "+valueOut[1]);
System.out.println("Meters value: "+valueOut[2]);
System.out.println("Kilometers value: "+valueOut[3]);


}
}
Feel free to correct my mistakes, but please remember - I'm new to this! :)

[Some Penguin]

It's you. Your constants are 1/x over what they should be, and you're dividing where you should be multiplying.

[Queue29]

Java is no worse at math than any other IEE-754 conforming language, which is pretty much all of them.