Is it possible to create custom behavior for a constructor in a derived class by overriding it?

In Java, constructors are not inherited and cannot be overridden in subclasses. Each class must explicitly declare its own constructors. When creating a subclass object, the superclass constructor is called first (explicitly via super() or implicitly), and then the subclass constructor body is executed.

If you need to change the behavior of a constructor in a derived class, you should define a new constructor in the subclass, which can call the superclass constructor and add its own logic:

class Parent {
    Parent() {
        System.out.println("Parent constructor");
    }
}

class Child extends Parent {
    Child() {
        super(); // call to the parent constructor
        System.out.println("Child constructor");
    }
}

Thus, you cannot "override" a constructor, but you can define your own with the desired behavior.