Write a Java program with least two classes. Using the circle object to represent it. The class must have at least one (non-static) setter method and one (non-static) getter method. Implement at least on test that invokes the setter and getter method and the corresponding getter method so that the value out == the the value in ```javapublic class Circle { // instance variables - replace the example below with your own. private double radius; private double circumference; public Circle (double r) { this.radius = r; this.circumference = 2 * Math.PI * r; } public double getRadius () { return this.radius; } public double getCircumference () { return this.circumference; }}```### Explanation- **Class Definition**: The `Circle` class models a circle with properties for its radius and circumference.- **Instance Variables**: - `radius`: A private variable to store the radius of the circle. - `circumference`: A private variable to store the circumference of the circle.- **Constructor**: - `Circle(double r)`: Initializes a new `Circle` object with a specified radius `r`. Calculates the circumference using the formula `2 * Math.PI * r`.- **Methods**: - `getRadius()`: Returns the radius of the circle. - `getCircumference()`: Returns the circumference of the circle.This class demonstrates encapsulation by keeping the variables private and providing public methods to access the properties of the circle.

Algorithm/Program Plan: Create a class Circle Create the default constructor Create a…

Answered: Write a Java program with least two…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Question

Write a Java program with least two classes. Using the circle object to represent it. The class must have at least one (non-static) setter method and one (non-static) getter method. Implement at least on test that invokes the setter and getter method and the corresponding getter method so that the value out == the the value in

```java
public class Circle {
// instance variables - replace the example below with your own.
private double radius;
private double circumference;

public Circle (double r) {
this.radius = r;
this.circumference = 2 * Math.PI * r;
}

public double getRadius () {
return this.radius;
}

public double getCircumference () {
return this.circumference;
}
}
```

### Explanation

- **Class Definition**: The `Circle` class models a circle with properties for its radius and circumference.

- **Instance Variables**:
- `radius`: A private variable to store the radius of the circle.
- `circumference`: A private variable to store the circumference of the circle.

- **Constructor**:
- `Circle(double r)`: Initializes a new `Circle` object with a specified radius `r`. Calculates the circumference using the formula `2 * Math.PI * r`.

- **Methods**:
- `getRadius()`: Returns the radius of the circle.
- `getCircumference()`: Returns the circumference of the circle.

This class demonstrates encapsulation by keeping the variables private and providing public methods to access the properties of the circle.

Expert Solution

Step 1

Algorithm/Program Plan:

Create a class Circle
1. Create the default constructor
2. Create a parameterized constructor
3. Create the following non-static methods
  1. Create a setter method for the radius
  2. Create a getter method for the radius
  3. Create another getter method to get the circle area
  4. Create another getter method to get the circle circumference
4. End Circle class
Create the second class Main to test the Circle class
1. Create a static main method
  1. Create two objects of the Circle class and print the corresponding result.
2. End-Main class
End

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