I have seen the following code , where i want to add the results one by one into an array

Question

    public static void main(String[] args) {
    int limit = 100;
    System.out.println("Prime numbers between 1 and " + limit);
    for(int i=1; i < 100; i++){
        boolean isPrime = true;
        for(int j=2; j < i ; j++){

            if(i % j == 0){
                isPrime = false;
                break;
            }}
        // print the number 
        if(isPrime)
            System.out.print(i + " ");
    }}}

I want to compare the each element in the result .So i want to add this result into an array. How can i add the result of this program into a array?

https://stackoverflow.com/questions/2843366/how-to-add-new-elements-to-an-array — Hearner, Jun 28 '18 at 11:44
https://docs.oracle.com/javase/7/docs/api/java/util/Collection.html — vincrichaud, Jun 28 '18 at 11:52
Possible duplicate of [How to add new elements to an array?](https://stackoverflow.com/questions/2843366/how-to-add-new-elements-to-an-array) — Amit Kumar, Jun 28 '18 at 12:03

score 1 · Answer 1 · answered Jun 28 '18 at 11:46

1

You can use ArrayList to store all the prime numbers you found.

List primeNumbers = new ArrayList();

then add the number into list using 'add' method of the list.

if(isPrime){
  primeNumbers.add(i);
}

answered Jun 28 '18 at 11:46

efex09

417
2
12

score 0 · Answer 2 · edited Jun 29 '18 at 18:07

0

You can use a lambda in java8. for example

List<Integer> primes = IntStream.rangeClosed(2, 100)
            .filter(i -> IntStream.rangeClosed(2, (int) Math.sqrt(i)).allMatch(j -> i % j != 0))
            .boxed().collect(toList());

    System.out.println(primes);

edited Jun 29 '18 at 18:07

Gurinder

943
2
9
19

answered Jun 28 '18 at 11:52

Faiz Akram

559
4
10

I have seen the following code , where i want to add the results one by one into an array

2 Answers2