Can abstract class have constructors in Java?

Question

Can I declare an abstract class with no abstract methods in it in Java, if yes then how?

Answer 1

Yes.

Take for example this simple code:

public abstract class A {
  A() {
      build();
  }

  abstract void build();
}

---

public class B extends A {

    void build() {
        System.out.println("Building a B object..");
    }

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

}