System.out.println doesn’t show text in console (IntelliJ)

I am writing a program which part is presented below:

public class Portal {

    private String name;
    private int[] positions;              // positions of "ship"
    private static int moves = 0;         // moves made by player to sink a ship
    public static int shot;               // the value of position given by player
    private int hits = 0;                 // number of hits
    private int maxSize = 4;              // max size of ship (the size will be randomized)
    int first;                            // position of 1st ship block
    int size;                             // real size of ship (randomized in setPortal method)

    public void checkIfHit(){
        for (int i : positions){
            if (i == shot){
                System.out.println("Hit confirmed");
                hits++;
            } else if (hits == positions.length){
                System.out.println("Sunk");
            } else {
                System.out.println("Missed it");
            }
        }
        moves++;
    }

    public void setPortal(){
        size = 1 + (int)Math.random()*maxSize;
        for (int i = 0; i < size - 1; i++){
            if (i == 0){
                positions[i]= 1 + (int)Math.random()*positions.length;
                first = positions[i];
                System.out.println(positions[i]);
                continue;
            }
            positions[i]= first + 1;
            System.out.println(positions[i]);

        }
    }
}

public class Main{

    public static void main(String[] args){
        // write your code here
        Portal p1 = new Portal();
        p1.setPortal();
    }
}

code is split in two Java .class files.

The problem I’m dealing with is that using p1.setPortal(); doesn’t show up text in IntelliJ console. The program works though and returns 0.
I don’t have such problem in another program when I’ve put System.out.println in method other than main (also in separate class file).
What may be the cause of such issue?