Must have two constructors, one accepts nothing and another overloaded constructor that accepts parameters. Must have the accessor and mutator methods for each instance variable, and the toString method, besides the other methods required by the project description in the book.

Must test ALL (the two constructors, the accessors and mutators for each variable and the other methods if there is any) methods explicitly in the driver class's main method with at least two objects.

Java

PP 4.3 Write a class called Sphere that contains instance data that represents the sphere's diameter. Define the Sphere constructor to accept and initialize the diameter, and include getter and setter methods for the diameter. Include methods that calculate and return the volume and surface area of the sphere (see PP 3.6 0 for the formulas). Include a toString method that returns a one-line description of the sphere. Create a driver class called Multisphere, whose main method instantiates and updates several sphere objects