Java MyDouble Arithmetic Operations

class MyDouble // Java
{
  private double a; // private variable
  MyDouble(double a) // Constructor
  public String toString() // Print the variable of type MyDouble
  public MyDouble Add(MyDouble b) // Add the value of type MyDouble
  public MyDouble Add(long b) // Add the value of type long
  public MyDouble Sub(MyDouble b) // Subtract the value of type MyDouble
  public MyDouble Sub(long b) // Subtract the value of type long
  public MyDouble Mult(MyDouble b) // Multiply by the value of type MyDouble
  public MyDouble Mult(long b) // Multiply by the value of type long
  public MyDouble Div(MyDouble b) // Divide by the value of type MyDouble
  public MyDouble Div(long b) // Divide by the value of type long
};