Check if two double values are almost equal in Java

/*  w w  w.  j  a v  a  2  s  . co m*/
public class Main {
  final static double EPSILON = 0.0000001;
  public static void main(String[] argv) {
    double da = 3 * .3333333333;
    double db = 0.99999992857;

    // Compare two numbers that are expected to be close.
    if (da == db) {
      System.out.println("Java considers " + da + "==" + db);
    // else compare with our own equals method
    } else if (equals(da, db, 0.0000001)) {
      System.out.println("True within epsilon " + EPSILON);
    } else {
      System.out.println(da + " != " + db);
    }
  }

  /** Compare two doubles within a given epsilon */
  public static boolean equals(double a, double b, double eps) {
    if (a==b) return true;
    // If the difference is less than epsilon, treat as equal.
    return Math.abs(a - b) < eps;
  }

  /** Compare two doubles, using default epsilon */
  public static boolean equals(double a, double b) {
    if (a==b) return true;
    // If the difference is less than epsilon, treat as equal.
    return Math.abs(a - b) < EPSILON * Math.max(Math.abs(a), Math.abs(b));
  }
}