How to change a double to 2 or less decimal places

Question

hi
im trying to change a double to 2 decimal places
the reason is i have a angle that is sesitive to 1.0 x14
and it look rediculas to look at :)
i think on a calculater you use E exponents
but im unsure.

Answer 1

There's a DecimalFormat class. And also Formattable interface. Classes implenting the latter can be formatted using a Formatter which employs the notation common in C and other languages.
String has a format() method that allows a formatted string to be produced, and there are numerous printf() methods in PrintWriter, Console etc
public class RoundingEg {
    public static void main(String[] args) {
        double pi = Math.PI;
            // %.2f means "floating point number with 2 dp"
            // %n means "ewline"
        System.out.printf("%.2f%n", pi);
            // or to obtain a string
        String displayStr = String.format("%.2f", pi);
        System.out.println("Used as any other string: " + displayStr);
}