Cannot access a method call from non-static to non-static class/method

I am terribly sorry to have to bother you all with this silly question since I should really know this by now but here goes:

public class Toets
private String vak;
/**
* Constructor for objects of class Toets
*/
public Toets(String toetsVak)
{
vak = toetsVak;
new Vraag();
}
/**
* An example of a method - replace this comment with your own
*
* @param  y  a sample parameter for a method
* @return    the sum of x and y
*/
public void addVraag(int vraagID, String vraag, String antwoordA, String antwoordB, String antwoordC, String correcteAntwoord)
{
new Vraag(vraagID, vraag, antwoordA, antwoordB, antwoordC, correcteAntwoord);
}
public void printVraag(int vraagID)
{
Vraag.printVraag(vraagID);
}

which should be called from here:

public class Vraag
private int vraagID;
private String vraag;
private String antwoordA;
private String antwoordB;
private String antwoordC;
private String correcteAntwoord;    
/**
* Constructor for objects of class Vraag
*/
public Vraag()
{
vraagID = 0;
vraag = "";
antwoordA = "";
antwoordB = "";
antwoordC = "";
correcteAntwoord = "";
}
/**
* Constructor for objects of class Vraag
*/
public Vraag(int vraagID, String vraag, String antwoordA, String antwoordB, String antwoordC, String correcteAntwoord)
{
this.vraagID = vraagID;
this.vraag = vraag;
this.antwoordA = antwoordA;
this.antwoordB = antwoordB;
this.antwoordC = antwoordC;
this.correcteAntwoord = correcteAntwoord;
}
public void printVraag(int vraagID)
{
if(this.vraagID == vraagID)
{
System.out.println("Vraag " + vraagID + ".");
System.out.println(vraag);
System.out.println("A. " + antwoordA);
System.out.println("B. " + antwoordB);
System.out.println("C. " + antwoordC);
}
}

}

The thing I am trying to do is create a Test for a school and add questions one by one and print a question in accordance with the designated ID (AKA question number); we are not allowed to use statics so I have looked at ways to accomplish this but I kind of lose it at the Java.lang.reflection stuff.

The thing is that I need to be able to create multiple instances of Vraag and call the print method of each one which I apparently can not do at the moment.

Instead of providing Vraag as attribute, you simple provide List<Vraag>.

Everytime when you create new Vraag object simply put into list.

And while printing all attributes of particular object you can filter out record based on passed Id.

Try below code it will help you.

class Toets {
private String vak;
private List<Vraag> vraagList;
public Toets(String toetsVak) {
vak = toetsVak;
}
public void addVraag(int vraagID, String att, String antwoordA, String antwoordB, String antwoordC, String correcteAntwoord) {
vraagList.add(new Vraag(vraagID, att, antwoordA, antwoordB, antwoordC, correcteAntwoord));
}
public void printVraag(int vraagID) {
//Java 8 code
Vraag obj=vraagList.stream().filter(vraag -> vraag.getVraagID()==vraagID).collect(Collectors.toList()).get(0);
obj.printVraag(vraagID);
/* Before Java 8
for(Vraag obj:vraagList){
if(obj.getVraagID()==vraagID){
obj.printVraag(vraagID);
}
}*/
}
}
class Vraag {
private int vraagID;
private String vraag;
private String antwoordA;
private String antwoordB;
private String antwoordC;
private String correcteAntwoord;
public Vraag(int vraagID, String vraag, String antwoordA, String antwoordB, String antwoordC, String correcteAntwoord) {
this.vraagID = vraagID;
this.vraag = vraag;
this.antwoordA = antwoordA;
this.antwoordB = antwoordB;
this.antwoordC = antwoordC;
this.correcteAntwoord = correcteAntwoord;
}
public void printVraag(int vraagID) {
System.out.println("Vraag " + vraagID + ".");
System.out.println(vraag);
System.out.println("A. " + antwoordA);
System.out.println("B. " + antwoordB);
System.out.println("C. " + antwoordC);
System.out.println("correcteAntwoord. " + correcteAntwoord);
}
public int getVraagID() {
return vraagID;
}
public void setVraagID(int vraagID) {
this.vraagID = vraagID;
}
public String getVraag() {
return vraag;
}
public void setVraag(String vraag) {
this.vraag = vraag;
}
public String getAntwoordA() {
return antwoordA;
}
public void setAntwoordA(String antwoordA) {
this.antwoordA = antwoordA;
}
public String getAntwoordB() {
return antwoordB;
}
public void setAntwoordB(String antwoordB) {
this.antwoordB = antwoordB;
}
public String getAntwoordC() {
return antwoordC;
}
public void setAntwoordC(String antwoordC) {
this.antwoordC = antwoordC;
}
public String getCorrecteAntwoord() {
return correcteAntwoord;
}
public void setCorrecteAntwoord(String correcteAntwoord) {
this.correcteAntwoord = correcteAntwoord;
}
}

Question is hard to decipher for sure, but I assume you want a list/array or something to store those questions in and that can't be static?

If so, you don't need a static (guess you know what that means) object if a class that has the list isn't created multiple times, it has a list variable but that variable only exists once which I assume is what you want