Static Methods

• Every method must be in a class
• A static method is not invoked on an object
• Why write a method that does not operate on an object?
  Common reason: encapsulate some computation that involves only numbers. Numbers aren't objects, you can't invoke methods on them. E.g., x.sqrt() can never be legal in Java

• public class Financial
  {
     public static double percentOf(double p, double a)
     {
        return (p / 100) * a;
     }
     // More financial methods can be added here.
  }

• Call with class name instead of object:
  double tax = Financial.percentOf(taxRate, total);
• main is static–there aren't any objects yet