How to find Diameter, Area and Perimeter (Circumference) for a Circle in Java?

What is Circle?

A circle is a round shaped figure that has no corners or edges. If you have a radius for a circle, you could easily find out Area, Diameter and Circumference for a Circle.

Here are the formulas for the Circle.

• Area: A=πr2 (π = 3.14)
• Perimeter (Circumference): C=2πr (π = 3.14)
• Diameter: d=2r

Here is a simple Java program to find out Diameter, Area and Circumference of any given circle provided you have radius.

Create class CrunchifyCircleDiameterAreaCircumference.java

package crunchify.com.java.tutorials;

import java.text.DecimalFormat;
import java.util.Scanner;

/**
 * @author Crunchify.com
 * In Java How to find Diameter, Area and Circumference for a Circle?
 */
public class CrunchifyCircleDiameterAreaCircumference {
        
        public static void main(String[] args) {
                
                Scanner sc = new Scanner(System.in);
                crunchifyPrint("Enter a Circle Radius: ");
                double crunchifyRadius = sc.nextDouble();
                
                // Diameter = d=2r
                // Area = 2 x crunchifyRadius
                double crunchifyDiameter = 2 * crunchifyRadius;
                crunchifyPrint("===> Diameter: " + crunchifyDiameter);
                
                DecimalFormat df = new DecimalFormat("0.000000");
                
                // Area = A=πr2 (π = 3.14)
                // Area = PI * crunchifyRadius * crunchifyRadius
                double crunchifyArea = Math.PI * (crunchifyRadius * crunchifyRadius);
                crunchifyPrint("===> Area: " + df.format(crunchifyArea));
                
                // Circumference = C=2πr (π = 3.14)
                // Circumference = 2 * PI * crunchifyRadius
                double crunchifyCircumference = Math.PI * 2 * crunchifyRadius;
                crunchifyPrint("===> Circumference: " + df.format(crunchifyCircumference));
        }
        
        private static void crunchifyPrint(String s) {
                System.out.println(s);
        }
}

Result:

Just run above program as a Java Program in Eclipse or IntelliJ IDEA.

Enter a Circle Radius: 
5

===> Diameter: 10.0
===> Area: 78.539816
===> Circumference: 31.415927

Process finished with exit code 0

Enter a Circle Radius: 
10

===> Diameter: 20.0
===> Area: 314.159265
===> Circumference: 62.831853

Process finished with exit code 0

Let us know if you face any issue running above program.

The post How to find Diameter, Area and Perimeter (Circumference) for a Circle in Java? appeared first on Crunchify.

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