java - Trying to calculate the average in an ArrayList -


i'm trying write code takes in number of entries , stores in arraylist given specific condition. i'm not able find average of values stored in arraylist. here's code written far:

import java.util.arraylist; import java.util.scanner;  public class app {     private arraylist<integer> temp;     private int t;     private int count = 0;      public void main() {         scanner input = new scanner(system.in);         temp = new arraylist<>();         system.out.println("enter temperatures: ");         {             t = input.nextint();             if (t == -99) {                 system.out.println("program terminating..");                 break;             } else {                 temp.add(t);             }         } while (t != -99);         (int = 0; < temp.size(); i++) {             if (temp.get(i) > 40) {                 count++;             }          }         system.out.println(count);      } }

you have funky condition there; you're doing operations if value greater 40. code below takes account; if don't desire that, remove conditional.

in traditional manner, can use enhanced-for counter of values greater 40 , average those...

double sum = 0; for(integer : temp) {     if(i > 40) {         sum += i;         count++;     } }  if(count != 0) { // avoid divide-by-zero error here     system.out.println(sum / count); }

...or java 8, can use streams, filter out less 40, , average double instead:

system.out.println(temp.stream()                        .filter(x -> x > 40)                        .maptoint(integer::intvalue)                        .average()                        .getasdouble());

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