Problem 3: New Products, Java

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//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        return sales(AADBACBADC);
    }
    
    public void sales(String sale)
    {
        int A = 0;
        int B = 0;
        int C = 0;
        int D = 0;
        for(int i = 0; i < sale.length(); i++)
        {
            if(sale.substring(i).equals('A'))
            {
                A++;
            }
            if(sale.substring(i).equals('B'))
            {
                B++;
            }
            if(sale.substring(i).equals('C'))
            {
                C++;
            }
            if(sale.substring(i).equals('D'))
            {
                D++;
            }
        }
        if((A > B) && (A > C) && (A > D))
        {
            return A;
        }
        if((B > A) && (B > C) && (B > D))
        {
            return B;
        }
        if((C > A) && (C > B) && (C > D))
        {
            return C;
        }
        if((D > A) && (D > B) && (D > C))
        {
            return D;
        }
    }
        
}

[ + ] Show input
Compilation time: 1.52 sec, absolute service time: 1,66 sec