Java SE8 nee help with ArrayList !

[dronikal]

Hello!I'm studying Java SE 8 and i have to  create an ArrayList full of random numbers between 0 and 1000 . PLS help!
P.S I'm new to Java and programming so pls explain. I have this as script for now but i don't get why it won't add the random numbers:

package zadacha;

import java.util.ArrayList;
import java.util.Random;

public class reshenie {

    public static void main(String[] args) {
        ArrayList<Integer> list=new ArrayList<>(); 
        Random gen=new Random();
        for (int i = 0; i <list.size(); i++) {
            int counter=gen.nextInt();
            list.add(counter);
            
        }
        
    }

}
 

[elpiop]

you need to specify a boundary when calling nextInt() on the random number generator. For example, gen.nextInt(100) will generate random numbers from 0-100. 

[dronikal]

I figured out that i don't have a boundary and added it.But after the for cycle after i check the list shows its empty.

[dronikal]

oh lol found my mistake sorry for the post it appears since the list is empty before the for cycle its size is 0 and so the for cycle does absolutely nothing 

[elpiop]

In your for loop, your termination condition is i<list.size(). However, your list initially has size 0, so it does not add any numbers. You need to start the arraylist with an initial capacity (... new Arraylist<>(number)), or change list.size() to some number.

 

edit: posted at the same time as you, you're correct. 

[prolemur]

Change the terminating condition of the for loop to the amount of numbers you want in your list.

Using the list size itself would result in an infinite loop since you are constantly increasing the size of the list with each iteration.