I need to know what's wrong with my code and it's supposed to be in the Next-Line blocking style.

Question

import java.util.Scanner;

public class AreaOfCircle{public static void main(String[] args)
{
double PI = 3.14159;double get_this;
double v;
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter the radius of the circle:);
get_this = keyboard.nextDouble();
v=PI* get_this;
System.out.println(v );}}