Complex c = new Complex(2.5, 4.8); double real = c.getRealDouble();In this example, a new complex number is created with a real value of 2.5 and imaginary value of 4.8. The getRealDouble() method is then called on the complex number object, returning the real value (2.5) as a double. The getRealDouble() method is typically included in library packages for complex arithmetic operations, such as Apache Commons Math or JScience.