area of circle in java
import java.util.Scanner;
public class AreaOfCircle {
public static void main(String args[]){
int radius;
double area;
Scanner sc = new Scanner(System.in);
System.out.println("Enter the radius of the circle ::");
radius = sc.nextInt();
area = (radius*radius)*Math.PI;
System.out.println("Area of the circle is ::"+area);
}
}draw circle in java
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
public class DrawCircle extends Frame
{
// input the value for circle and square.
Shape circle=new Ellipse2D.Float(100.0f,100.0f,100.0f,100.0f);
// class paint to fill color in circle.
public void paint(Graphics g)
{
Graphics2D ga=(Graphics2D)g;
ga.draw(circle);
ga.setPaint(Color.blue);
ga.fill(circle);
}
public static void main(String args[])
{
// create a frame object for circle.
Frame frame=new DrawCircle();
frame.addWindowListener(new WindowAdapter()
{
public void windowClosing(WindowEvent we)
{
System.exit(0);
}
});
// circle coordinates.
frame.setSize(300, 250);
frame.setVisible(true);
}
}Area of a Circle in Java Programming
import java.util.Scanner;
public class Main {
public static void main(String[] args){
double R,A;
Scanner sc = new Scanner(System.in);
R = sc.nextDouble();
A = 3.14159 * R * R;
System.out.printf("A=%.4f\n", A);
}
}Copyright © 2021 Codeinu
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