Java newbie needs help again

my quick question is.

how would i be able to allow this method to return it's damageDelt value? i want to use this value to be able to subtract from another class field variable hitpoint value. how can i do this? as i would like this method to reduce the hitpoints from another objects hitpoints.

Thank you

package com.DavidLee.Programming;

public class Main {

    public static void main(String[] args) {

        new Main().railGunAttack();
        System.out.println();

    }

    public void railGunAttack() {

        int randomNumber = (int) (Math.random() * 100 + 1);

        if (randomNumber > 0 && randomNumber < 50) {
            int damageDelt = 2 * randomNumber;
            System.out.println("Railgun did " + damageDelt + " Damage");
        } else if (randomNumber > 50 && randomNumber < 80) {
            int damageDelt = 4 * randomNumber;
            System.out.println("Railgun did " + damageDelt + " Damage");
        } else if (randomNumber > 80 && randomNumber < 100) {
            int damageDelt = 50 - randomNumber;
            System.out.println("Railgun did " + damageDelt + " Damage " + "Railgun projectiles glazed the target");
        } else
            System.out.println("Railgun missed target");
    }
}