Is it mandatory to call the constructor of the base class when creating a derived class?

In Java, when creating a subclass, calling the superclass constructor is mandatory, but it can be implicit. If the subclass constructor does not explicitly call the superclass constructor via super(), the compiler automatically inserts a call without arguments to the superclass constructor. However, if the superclass does not have a no-argument constructor, the superclass constructor must be explicitly called with the required arguments.

Example:

class Base {
    Base(int x) { }
}

class Derived extends Base {
    Derived() {
        super(10); // mandatory call to superclass constructor with parameter
    }
}

If the superclass has a no-argument constructor, the call to super() is automatically inserted, and explicitly writing it is not necessary.