Pi Calculator Java

picalc.java

package picalc;

import java.math.BigDecimal;
import java.math.MathContext;

public class Main {

	public static void main(String[] args) {
		
		BigDecimal num = new BigDecimal(4.0);
		BigDecimal pi = new BigDecimal(0);
		boolean plus = true;
		
		BigDecimal den = new BigDecimal(1);
		BigDecimal max = new BigDecimal(1000000000);
		
		while (den.compareTo(max) == -1) {
			
			if (plus) {
				pi = pi.add(num.divide(den, MathContext.DECIMAL128));
				plus = false;
			} else {
				pi = pi.subtract(num.divide(den, MathContext.DECIMAL128));
				plus = true;
			}
			den = den.add(new BigDecimal(2));
			System.out.println(pi.toString());
		}
		
		System.out.println("--------------------------------\n"
						 + "Calculated Pi = " + pi 		 + "\n"
						 + "Math Static Pi = " + Math.PI + "\n"
						 + "--------------------------------");
	}
}