Why default constructor is required in a parent class if it has an argument-ed constructor?

Question

Why default constructor is required(explicitly) in a parent class if it has an argumented constructor

class A {    
  A(int i){    
  }
}

class B extends          


        

Answer 1

Say this compiled, what would you expect it to print?

class A{
  A(int i){
    System.out.println("A.i= "+i);
  }
}

class B extends A {
  public static void main(String... args) {
    new B();
  }
}

When A is constructed a value for i has to be passed, however the compiler doesn't know what it should be so you have specify it explicitly in a constructor (any constructor, it doesn't have to be a default one)