java classes and methods

1import java.lang.Math;
2import java.util.Scanner;
3
4public class HelloWorld {
5  public static void main(String[] args) {
6    class ResultNumberShape {
7
8            double number;
9
10            public boolean isSquare(double number) {
11
12                double result = Math.sqrt(number);
13                return ((result - Math.floor(result)) == 0);
14
15            }
16        }
17
18        ResultNumberShape checkNumber = new ResultNumberShape();
19
20        System.out.println("Enter any number:");
21        Scanner scanner = new Scanner(System.in);
22        double num = scanner.nextDouble();
23
24        scanner.close();
25
26        if (checkNumber.isSquare(num)) {
27            System.out.println(num + " is a sqaure number!");
28        } else {
29            System.out.println(num + " is not a square!");
30        }
31    
32  }
33}
34