Section 1 - The Math Class


The Math class provides several methods which perform mathematical operations, and several useful constants.. All methods and constants are declared static, so an object of class Math never needs to be created.


Section 2 - Math Class Constants


The Math class defines two constants: PI (for a circle’s circumference) and E (for natural logarithms).


Listing 1 -

import java.text.DecimalFormat;
public class CalculateCircumference
    public static void main(String[] args)
        DecimalFormat output = new DecimalFormat("##.00");

        double diameter = 4.0;
        double circumference = diameter * Math.PI;
        System.out.println("circumference = " +


circumference = 12.57





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