Yes it's possible.
This is how you use scanner:
How can I read input from the console using the Scanner class in Java?
Intro to content in URL above:
Scanner sc = new Scanner(System.in);
int i = sc.nextInt();
System.out.println("Enter your username: ");
Scanner scanner = new Scanner(System.in);
String username = scanner.nextLine();
EDIT:
Here's a program that applies the concept above and takes radius from user and draws a circle on a frame:
import java.awt.Frame;
import java.awt.Graphics;
import java.util.Scanner;
public class Painting extends Frame{
int num=0;
Painting(){
super("Paint");
setSize(300,300);
setVisible(true);
Scanner myScanner = new Scanner(System.in);
System.out.println("Enter Radius");
num = myScanner.nextInt();
repaint();
}
public void paint(Graphics g){
g.drawOval(50, 50, (2*num), (2*num));
}
public static void main(String[] args)
{
new Painting();
}
}