Card Class

package gameof21;

import java.lang.Math;

public class Cards {
    private static int num1, num2, num3, sum;
    private static boolean third;
    String getCards;

    public Cards(boolean three){
        third = three;
    }

    public double genNum() {
        double num = (13 - 1 + 1) * Math.random() + 1;
        if (num > 10) {
            num = 10;
        }
        return(num);
    }

    public int getSum() {
        num1 = (int) this.genNum();
        num2 = (int) this.genNum();
        if (third == true) {
            num3 = (int) this.genNum();
        } else {
            num3 = 0;
        }
        sum = num1 + num2 + num3;
        return(sum);
    }

    public boolean verify() {
        boolean over = false;
        if (sum > 21) {
            over = true;
        }
        return(over);
    }

    public String getCards() {
        String cards;
        if (num3 == 0) {
            cards = " got cards: " + num1 + ", " + num2 + " which add up to a total of: " + sum;
        } else {
            cards = " got cards: " + num1 + ", " + num2 + ", and " + num3 + " which add up to a total of: " + sum;
        }
        return (cards);
    }
}