Teach me java

package package_3;
import static java.lang.System.out;
import java.util.Scanner;
public class Main {

    public static void main(String[] args) {

        poundToKilo();
    }
    /*
     * This program asks from the user for weight in pound, converts
     * the input to kilo, then displays the result in various precisions.
     */
    static void poundToKilo()
    {
        //"final" keyword prevents the variable from being modified
        final double KILO_PER_POUND = 0.4536;
        double weightInPound;//for storing user input
        try(Scanner input = new Scanner(System.in))
        {
            out.print("Enter weight in pound: ");
            weightInPound = input.nextDouble();
        }
        //Data processing
        double kilo = weightInPound * KILO_PER_POUND;
        //Display the result in difference precisions
        out.printf("Default roundup: %f\n", kilo);
        out.printf("Round up to 2 points: %-10.2f\n", kilo);
        out.printf("Round up to 3 points: %10.3f\n", kilo);
    }
}