Basic JS methods not recognized?

Sorry, but this is Java code, not JavaScript? and you are editing .java file, aren't you?

Try changing your code as follows:

List list = new ArrayList<>();
for (int team : allTeams) {
    list.add(team);
}

if (!(list.contains(teamNr))) {
    System.out.println("nothing found");
    list.add(teamNr);
}

Hi Elena,

Thanks for your aswer, unforetunaly this gives me sort of the same error? here the 'contains' method is also not recognized. I trying this because of the fact that I'm not getting the the named objects to work?

What I realy would like to do is to create an array, filled with objects whicht contains multiply datatypes, something like this:

public void teamAanmaken() {
    int teamNr;
    String inOut;
    int postNr;
    String date;
    var allTeams = [
    {teamNr: 101, inOut: "IN", postNr: 1, date: "31-07-2019,  22:13"}
    {teamNr: 101, inOut: "OUT", postNr: 1, date: "31-07-2019, 22:25"}
    {teamNr: 102, inOut: "IN", postNr: 1, date: "30-07-2019, 17:45"}
    {teamNr: 301, inOut: "IN", postNr: 2, date: "30-07-2019, 18:45"}
    ];

Is this something that is possible? I found this piece of code online but it does not seem to work in IntelIJ ?

>here the 'contains' method is also not recognized

it is recognized for me. Did you import the java.util.*? What does your class look like? Please provide a complete code snippet

Your

var allTeams = [{}]

is a JavaScript code, what makes you think that adding it to java method can work?

Hi Elena,

Here's my total code, please bare with me, these are my first steps on javascripting. :)
At this moment purely based on the console, no HTML yet.

import java.util.Date;
import java.util.Scanner;

public class ProgrammaHikeTracker {

    private boolean postBekend = false;
    private int postNr;
    private String inOut = "In";

    public int menu(){

        Scanner myScanner = new Scanner(System.in);
        if(postBekend == false){
            System.out.println("█████████████████████████████████");
        } else{
            System.out.println("█████████████ Post " + postNr + " ████████████");
        }
        System.out.println("█             Menu              █");
        System.out.println("█  1. Aanmaken team             █");
        if(postBekend == false){
            System.out.println("█  2. Post selecteren           █");
        } else {
            System.out.println("█  2. Andere post selecteren    █");
        }
        if(postBekend == false){
            System.out.println("█                               █");
        } else {
            System.out.println("█  3. Aanmelden op post         █");
        }
        if(postBekend == false){
            System.out.println("█                               █");
        } else {
            System.out.println("█  4. Afmelden op post          █");
        }
        System.out.println("█                               █");
        System.out.println("█  6. Team overzicht            █");
        System.out.println("█  7. Post overzizht            █");
        System.out.println("█                               █");
        System.out.println("█████████████████████████████████");
        System.out.println("   ");
        System.out.println("Geef je keuze op:   ");
        int menuKeuze = myScanner.nextInt();
        return menuKeuze;
    }

    public int teamNummer(){
        // Uitvragen team nummer.
        int teamNr;
        Scanner myScanner = new Scanner(System.in);
        System.out.println("Geef je teamnummer op");
        teamNr = myScanner.nextInt();
        return teamNr;

    }
    public int postNummer(){
        // Uitvragen post nummer.
        Scanner myScanner = new Scanner(System.in);
        System.out.println("Welke post beman je? ");
        postNr = myScanner.nextInt();
        postBekend = true;
        return postNr;
    }

    public void teamAanmaken() {

        int teamNr;
        String inOut;
        int postNr;
        String date;
        var allTeams = [
        {teamNr: 101, inOut: "IN", postNr: 1, date: "31-07-2019,  22:13"}
        {teamNr: 101, inOut: "OUT", postNr: 1, date: "31-07-2019, 22:25"}
        {teamNr: 102, inOut: "IN", postNr: 1, date: "30-07-2019, 17:45"}
        {teamNr: 301, inOut: "IN", postNr: 2, date: "30-07-2019, 18:45"}
        ];

        /*
        int[] allTeams = {101, 102, 103, 104, 105, 201, 202, 203, 301, 302, 303}; // make dynamic later on
        int teamNr;

        Scanner myScanner = new Scanner(System.in);
        System.out.println("Geef je teamnummer op");
        teamNr = myScanner.nextInt();
        // check of teamnummer voorkomt in array
            if (boolean n = allTeams.includes(teamNr) == false;) {
                System.out.println("Team bestaat al.");
            }
            allTeams.push(teamNr);
        */
        }

    public void teamAanmelden() {
        // Aanmelden op post
        int sessieTeam = teamNummer();       // uitvragen team nummer
        // controleren of postnr al 'ingeladen' is, zo niet, dan vragen om postnummer.
            if(postBekend == false){
              int postNr = postNummer();
            }
            inOut = "IN";
        // wegschrijven aanmelding
        String aanmeldRegel = sessieTeam + ", " + inOut + ", " + postNr + ", " + new Date();
        System.out.println(aanmeldRegel);
        };

    public void teamAfmelden() {
        // afmelden op post
        int sessieTeam = teamNummer();       // uitvragen team nummer
        if(postBekend == false){
            int postNr = postNummer();
        }
        inOut = "UIT";
        // wegschrijven afmelding
        String aanmeldRegel = sessieTeam + ", " + inOut + ", " + postNr + ", " + new Date();
        System.out.println(aanmeldRegel);
    };

    public void run () {
            // Begin van code
        boolean menuActief = true;
        while(menuActief = true){   // altijd terug naar menu.
            int menuKeuze = menu();
            if (menuKeuze == 1) {
                 //teamAanmaken();
             }
             if (menuKeuze == 2) {
                 postNummer();
             }
             if (menuKeuze == 3) {
                teamAanmelden();
            }
            if (menuKeuze == 4) {
                teamAfmelden();
            }
            if (menuKeuze == 5) {
                // leeg
            }
            if (menuKeuze == 6) {
                // Team overzicht
            }
            if (menuKeuze == 7) {
                //Post overizcht
            }
        }
    }
        // Einde van code

    public static void main(String[] args) {
            // aanroepen
            new ProgrammaHikeTracker().run();
    }
}

>Here's my total code, please bare with me, these are my first steps on javascripting. 

This is (mostly) Java, NOT JavaScript!!!

var allTeams = [{}] is JavaScript, everything else is Java. You can't mix both.

Before moving on, let's decide on a language your are going to use, environment, things you are going to accomplish, etc.