Java program to calculate area of a circle
import java.util.Scanner;
public class CalculateAreaOfCircle
{
public static void main(String[] args)
{
double radius;
double pi = 3.1415, area;
Scanner sc = new Scanner(System.in);
System.out.println("Please enter radius of circle: ");
radius = sc.nextDouble();
area = pi * radius * radius;
System.out.println("Area of circle: " + area);
sc.close();
}
}how to create a circle in java
public class scratch {
public static void main(String[] args) {
JFrame window = new JFrame();
window.setTitle("Christmas Tree");
window.setSize(700, 600);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.setVisible(true);
DrawingComponent DC = new DrawingComponent();
window.add(DC);
}
}
class DrawingComponent extends JComponent{
public void paint(Graphics graph0){
Graphics2D graph = (Graphics2D) graph0;
Ellipse2D.Double circle = new Ellipse.Double(5, 5, 25, 25);
graph.fill(circle);
}
}Copyright © 2021 Codeinu
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