non-static method cannot be referenced from a static context.

[blackstormattack]

I have the line of code in a class X:
{code}Database.addIngenieur(new Ingenieur(naam,voornaam,paswoord,ranking,email,tel efoon));{code}


In my Database class I have the method addIngenieur:
{code}public void addIngenieur(Ingenieur deIngenieur)
{
ingenieurs.add(deIngenieur);
}{code}

which should add the ingenieur to the arraylist ingenieurs.

My class Ingenieur looks like the following:

{code}
public class Ingenieur
{
private String naam;
private String voornaam;
private String ranking;
private String email;
private String telefoonnummer;
private String nota;
private String paswoord;



public Ingenieur(String deNaam, String deVoornaam, String hetPaswoord, String deRanking, String deEmail, String hetTelefoonnummer)
{
naam = deNaam;
voornaam = deVoornaam;
ranking = deRanking;
email = deEmail;
telefoonnummer = hetTelefoonnummer;
paswoord = hetPaswoord;
nota = "";
}

//Some other methods below...

}
{code}

But it gives me the following error in class X: non-static method addIngenieur(Ingenieur) cannot be referenced from a static context.

I just don´t see the error which should be obvious to a real programmer.
Can anyone help me?

Best Regards

[OrangeDog]

addIngenieur is not a static method, yet you are trying to call it on it's class, rather than an instance of the class.

[makpandian]

You can access only static methods with out objects.Hence if you want to do so,Change the method in static mode.

[mtyoung]

i think you should create the class object
if you change method to static, variable used also need to be changed to static

[ron87]

if a method is not static the u have to call it using object of class.
if u directly want to call a method using class name then declare it as static.
You can not call non static method from static context.

[Eranga]

Just go through the following page, it may help you to have a better idea about the static members in Java.

The Essence of OOP using Java: Static Members