public static void main(String[] args) {
BufferedReader br;
String fromUnit = null;
String toUnit = null;
double value = 0;
// prompt the user to enter unit to convert from
System.out.print("Convert from: ");
// open up standard input
br = new BufferedReader(new InputStreamReader(System.in));
try {
fromUnit = br.readLine();
} catch (IOException ioe) {
System.exit(1);
}
// prompt user to enter unit to convert to
System.out.print("Convert to: ");
br = new BufferedReader(new InputStreamReader(System.in));
try {
toUnit = br.readLine();
} catch (IOException ioe) {
System.exit(1);
}
// create new UnitConvert objects
UnitConverter from = new UnitConverter(fromUnit);
UnitConverter to = new UnitConverter(toUnit);
// prompt user to enter initial value to convert
System.out.print("Value: ");
br = new BufferedReader(new InputStreamReader(System.in));
try {
value = Double.parseDouble(br.readLine());
} catch (IOException ioe) {
System.exit(1);
}
double metric = from.toMetric(value);
double converted = to.fromMetric(metric);
if (converted < 0) {
System.out.println("ERROR: Bad Input");
} else {
System.out.println(value + " " + fromUnit + " = " + converted + " " + toUnit);
}
}
