Project scenario:

An abstract class A in Java needs to initialize a member variable of the same type anonymously,

public class Main {
  public static void main(String[] args) {
    new B();
  }

}

abstract class A {
   A a = new A() {//Member variables of the same type
     @Override
     void do_sth() {
       System.out.println("do nothing");
     }
   };
  abstract void do_sth();
}

class B extends A{

  @Override
  void do_sth() {
	System.out.println("doing B");
  }
}

Problem Description:

Java.lang.stackoverflowerror directly overflowed the stack

Cause analysis:

When creating object B, the anonymous inner class in object a is also created, and the inner class creates its own inner class, resulting in infinite recursion.

Solution:

Try not to use anonymous inner classes as member variables. If you want to use them, be sure to pay attention to whether they contain the possibility of infinite recursion.