Why instance variables get initialized before constructor called?

Question

I have this following piece of code:

public abstract class UCMService{
    private String service;     

    protected DataMap dataMap = new DataMap(); 

            


        

Answer 1

Short answer:
Because the spec says so.

Long answer:
It would be very strange for the constructor to be unable to use inline-initialized fields.

You want to be able to write

SomeService myService = new SomeService();
public MyConstructor() {
    someService.doSomething();
}