[Java Basics] -- parent class Constructor

When creating any Java object, the program will first call the non-static initialization block of each parent class and the parent class Constructor (always starting from the object and calling the non-argument constructor by default) to execute initialization, finally, the non-static initialization block and constructor of this class are called to execute initialization.

The following code:

Class A {printf ("A");} public a () {printf ("()");}} class B extend a {printf ("B");} public B () {printf ("B ()");} Main () {B = new B ();}}

Output result:

A

A ()

B

B ()