Help me! with summing :(

Question

I'm new at java programming, and im working on a program that creates random numbers, the range of the random numbers is -1000 to 1000... my problem is i need a way to add up all the Positive numbers, and negative numbers seperately. Heres my program so far:
import java.util.Random;
public class Averages
     public static void main(String[] args)
          Random generator = new Random ();
          int HowManyNums, Num, Flip, Positives, Negatives;
          String Words = "";
          HowManyNums = 0;
          Positives = 0;
          Negatives = 0;
          SumOfPos = 0;
              while (HowManyNums<101)
              Num = generator.nextInt(1001);
              Flip = generator.nextInt(2);
              HowManyNums++;
              if(Flip == 0)
                   System.out.print(Num*-1+" ");
                   Negatives++;
              if(Flip == 1)
                   System.out.print(Num+" ");
                   Positives++;
          System.out.println();
          System.out.println();
          System.out.println();
          System.out.println("           Summary");     
          System.out.println("-----------------------------");
          System.out.println("Positive Numbers     = "+ Positives);
          System.out.println("Sum of Positives     = ");
}I'll accept any help, just remember they arent determined number, so it makes it a bit more complex... i was kinda wondering if there was a class for summing, that i couldnt find. Tell me the way to find the positives, and ill be able to find the sum of the negatives on my own

Answer 1

Im not sure if this is what you're looking for:
import java.util.Random;
import java.util.ArrayList;
public class Averages
     private Random           generator;
     private int           totalNums, num, flip, positives, negatives;
     private ArrayList      posNums, negNums;
     public Averages() {
          generator      =      new Random();
          posNums          =     new ArrayList();
          negNums          =     new ArrayList();
          run();
          showReport();
     public void run() {
          positives = 0;
          negatives = 0;
          while (totalNums<100)
              num      = generator.nextInt(1001);
              flip      = generator.nextInt(2);
              totalNums++;
              if(flip == 0)
                   num*=-1;
                   negNums.add(new Integer(num));
                   negatives++;
              if(flip == 1)
                   posNums.add(new Integer(num));
                   positives++;
     public int getSum(ArrayList lst) {
          int total = 0;
          for(int i=0; i<lst.size(); i++){
               int current     =     ((Integer)lst.get(i)).intValue();
               total          +=     current;
          return total;
     public void showReport() {
          System.out.println();
          System.out.println();
          System.out.println();
          System.out.println("           Summary");     
          System.out.println("-----------------------------");
          System.out.println("Positive Numbers     = "+ positives);
          System.out.println("Sum of Positives     = "+ getSum(posNums));
          System.out.println("Negative Numbers     = "+ negatives);
          System.out.println("Sum of Negatives     = "+ getSum(negNums));
     public static void main(String[] args)
          new Averages();     
}