The constructor is never executed immediately after new()!!!!!

In the delegate event model , The source generates an event and sends it to one or more listeners , Each listener must register with the event source .

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The result of the following procedure is ： 

class X{
	Y y=new Y();
	public X(){
		System.out.print("X");
	}
}
class Y{
	public Y(){
		System.out.print("Y");
	}
}
public class Z extends X{
	Y y=new Y();
	public Z(){
		System.out.print("Z");
	}
	public static void main(String[] args) {
		new Z();
	}
}

 YXYZ

This is a very valuable question for me ！

I used to think new Z(); after , Just do it Z The construction method of is back , But the fact is that my pattern is smaller .

When you new Z() after , I will first see if there is any inheritance relationship ,

If so, you will jump to the parent class first ,

The first thing to do in the parent class is not to execute the constructor of the parent class

The first thing is to initialize the member variables defined in the parent class ( Go through it one by one ), The constructor of the parent class will not be executed until the member variable is initialized ,