Why can't add an object to a Map from its constructor in Java?

Question

Java

public class Quest {

    static Map<Integer, Object> IDs;
    String Text;

    Quest(String Text, int ID){
        this.Text = Text;
        IDs.put(ID, this);
    }

The program throws a NullPointerException on the line IDs.put(ID, this);
What am I doing wrong?

Answer 1

What am I doing wrong?

Declared a variable but didn't give it a value.