Hello! Just started to learn Java, here's my code (very bad i know ._.)

package recurrencerelations;

import java.util.*;

public class RecurrenceRelations {

public static void main(String[] args) {
    int startValue, endValue;
    String userInput;
    ArrayList userInputArray = new ArrayList();
    Scanner scan = new Scanner(System.in);

    System.out.println("Welcome to Recurrence Relation! "
            + "please type the operations you want");
    userInput = scan.nextLine();
    System.out.println("Now type in the initial value");
    startValue = scan.nextInt();
    System.out.println("Now type the finishing value");
    endValue = scan.nextInt();

    String[] result = userInput.split("\\s+");

    int recurValue = startValue;

    for(int i = 0; i <= endValue; i ++) {
        System.out.println("Term " + i + ": " + recurValue);

        for (int j =0; j < result.length; j++) {

                if(result[j].charAt(1) == '-') {
                    switch (result[j].charAt(0)) {
                        case '+':
                            recurValue += -Integer.parseInt(result[j].substring(2));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        case '-':
                            recurValue -= -Integer.parseInt(result[j].substring(2));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        case '*':
                            recurValue *= -Integer.parseInt(result[j].substring(2));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        case '/':
                            recurValue /= -Integer.parseInt(result[j].substring(2));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        default:
                            //System.out.println("Not a valid operation, the system will close now");
                            break;
                    }
                } else {
                switch (result[j].charAt(0)) {
                        case '+':
                            recurValue += Integer.parseInt(result[j].substring(1));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        case '-':
                            recurValue -= Integer.parseInt(result[j].substring(1));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        case '*':
                            recurValue *= Integer.parseInt(result[j].substring(1));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        case '/':
                            recurValue /= Integer.parseInt(result[j].substring(1));
                            //System.out.println("Term " + i + ": " + recurValue);
                            break;
                        default:
                            System.out.println("Not a valid operation, the system will close now");
                            break;
                    }
                }
            } 



        }

    }

}