solved question 2.19 closes #9

Difficult01/Question 2.19/Circle.java

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+import java.util.Scanner;
+
+public class Circle {
+
+	private Scanner keyboardInput;
+	private int circleRadius;
+	private int circleDiameter;
+	private double circleCircumference;
+	private double circleArea;
+
+	public Circle() {
+		keyboardInput = new Scanner(System.in);
+		System.out.println("Enter the Circle's radius");
+		circleRadius = keyboardInput.nextInt();
+		circleDiameter = circleRadius*2;
+		circleCircumference = circleDiameter*Math.PI;
+		circleArea = circleRadius*circleRadius*Math.PI;
+
+	}
+
+
+	@Override
+	public String toString() {
+		return String.format("Circle Details\n Diameter: %d"+
+			"\n Circumference: %.3f\n Area: %.3f", 
+			circleDiameter, circleCircumference, circleArea);
+	}
+
+	public static void main(String[] args) {
+		Circle circle = new Circle();
+
+		System.out.println(circle.toString());
+
+	}
+}