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    Thank you for your answer!
    In case 1 i want to register a person in arrayList if the person does not already exist but the code do nothing so far ?!
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    import java.util.ArrayList;
    import java.util.Scanner;

    public class Prylregister {


    Scanner tangentbord = new Scanner(System.in);

    public static void main(String[] args) {
    ...
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