Java Programs easy way

package New;

import java.util.Date;

import java.util.StringTokenizer;

public class Prog17 {

                static String op;

                public static void abc(String date) {

                                StringTokenizer st = new StringTokenizer(date, "/");

                                String d, m, y;

                                int y1;

                                d = st.nextToken();

                                m = st.nextToken();

                                y = st.nextToken();

                                y1 = Integer.parseInt(y);

                                y1 = y1 + 1;

                                String new_date = d + "/" + m + "/" + y1;

                                Date d1 = new Date(new_date);

                                int day = d1.getDay();

                                if (day == 0)

                                                op = "sunday";

                                else if (day == 1)

                                                op = "monday";

                                else if (day == 2)

                                                op = "tuesday";

                                else if (day == 3)

                                                op = "wednesday";

                                else if (day == 4)

                                                op = "thursday";

                                else if (day == 5)

                                                op = "friday";

                                else if (day == 6)

                                                op = "saturday";

                }

                public static void main(String[] args) {

                                String date = "16/07/2014";

                                abc(date);

                                System.out.println(op);

                }

}