I need help with a java code that

Write a Circle class that has the following fields: radius: a double PI: a double initialized with the value 3.14159 The class should have the following methods: Constructor. Accepts the radius of the circle as an argument. setRadius. A method that stores a value in a field getRadius. A method to get a value from a class's field getArea. Returns the area of the circle, which is calculated as area = PI x radius x radius getDiameter. Returns the diameter of the circle, which is calculated as diameter = radius x 2 getCircumference. Returns the circumference of the circle, which is calculated as circumference = 2 x PI x radius Write a program that demonstrates the Circle class by asking the user for the circle's radius, creating a Circle object, and then reporting the circle's area, diameter, and circumference. Include comments explaining what the functions do