From your comment, it looks like you just need help with who will be left without a car. You need to use modular division (some people call it remainder) with the percent sign (%). Here is the line of code you are missing:
System.out.println("Amount of people without a car: "+students%sum);
The full code for the program is:
import java.util.Scanner;
public class Solution {
public static void main(String[] args) [
Scanner s=new Scanner(System.in);
int carCapacity=5;
System.out.println("How many students?");
int students=s.nextInt();
int cars=students/carCapacity;
int leftOver=students%carCapacity;
System.out.println("Cars needed: "+cars);
System.out.println("Students left over: "+leftOver);
}
}
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solved How to get a remainder in java