RainFallMain - DataStructure

import java.util.ArrayList;
import java.util.Scanner;

public class Mainclass {

public static void main(String args[]) {

        rainfall r[] = new rainfall[12];
        Scanner sc = new Scanner(System.in);

        ArrayList monthName = new ArrayList ();

        monthName.add("January");
        monthName.add("February");
        monthName.add("March");
        monthName.add("April");
        monthName.add("May");
        monthName.add("June");
        monthName.add("July");
        monthName.add("August");
        monthName.add("September");
        monthName.add("October");
        monthName.add("November");
        monthName.add("December");

        int rain=0;
        double totalRf =0;
        double max=0;
        double min=9999999;
        double avrg=0;
        String month="";
        int maxIndex=0;
        int minIndex=0;

        for ( int i=0; i <12;i++) {
            System.out.println("Please enter the total rainfall for month: "+monthName.get(i));
            rain = sc.nextInt();
            r[i]= new rainfall(totalRf, avrg, max, min, rain);
            totalRf = totalRf + r[i].getRain();
        }

        avrg = totalRf/12;
        for (int i=0; i<12; i++) {
            if(r[i].getRain()>max) {
                max=r[i].getRain();
                maxIndex=i;
            }
        }
        for (int i=0; i<12; i++) {
            if(r[i].getRain()<min) {
                min=r[i].getRain();
                minIndex=i;

            }
        }

        System.out.println("Total rainfall: "+totalRf);
        System.out.println("Average rainfall: "+avrg);
        System.out.println("max rainfall: "+monthName.get(maxIndex)+ "  "+ r[maxIndex].getRain());
        System.out.println("min rainfall: "+monthName.get(minIndex)+ "  "+ r[minIndex].getRain());





    }

}