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Should superclasses have constructors?

By : user2175119
Date : October 16 2020, 08:10 AM
it fixes the issue A constructor is a method that you can be certain is called upon construction of a class instance, because the behaviour is enforced. Hence you can put code in the construction to ensure that the class is ready for use
In the case of a superclass, though you might not construct one directly, your child classes can receive some parameters (or you can hardcode them) and pass them to the parent constructor for action rather than doing the actioning themselves.
code :
class Animal{
  Animal(int numberOfLegs){}

class Dog:Animal{
  Dog(string breed): base(4) {} //call base constructor

class Cat:Animal{} //doesn't work; error "no argument is given that corresponds to formal parameter 'numberOfLegs'"
Animal[] x = new Animal[10]();
x[0] = new Dog();

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Passing fields to Scala subclass constructors that have Java parents without similar constructors

By : Anshad
Date : March 29 2020, 07:55 AM
Hope that helps I have an abstract base class, written in Scala, that extends a 3rd party (open source) Java 7 class: , You can just call setFoo in the body of Bar.
code :
abstract class Bar(val foo: Foo) extends Fizz {
abstract class Bar(foo: Foo) extends Fizz {
scala> class Bar(val foo: Foo) extends Fizz {
     |   setFoo(foo)
     | }
defined class Bar

scala> val bar = new Bar(Foo(1))
bar: Bar = Bar@3a384e3d

scala> bar.getFoo
res7: Foo = Foo(1)

scala> bar.foo
res8: Foo = Foo(1)

scala> bar.setFoo(Foo(2))

scala> bar.getFoo
res10: Foo = Foo(2)

scala> bar.foo
res11: Foo = Foo(1)  // still the old foo!!!

Resolving error-prone ConstructorLeaksThis warning on constructors which call other constructors

By : hardeep
Date : March 29 2020, 07:55 AM
like below fixes the issue Error-prone defines ConstructorLeaksThis problem:

How do primary constructors, secondary constructors and class members interact with each other in Kotlin?

By : Lajos
Date : March 29 2020, 07:55 AM
around this issue
the class members rely on the arguments in the primary constructor to be implemented
code :
<init>(initialCapacity: Int)
<init>(elements: Collection<E>)

JMockit : How to avoid code from superclasses' constructors

By : Dennis
Date : March 29 2020, 07:55 AM
may help you . If you are using jmockit, you do not have to do anything at all, as all the superclass constructors are mocked by default. In you unit test method you can just do:

What is the difference between delegating constructors in the member initializer list and in the body of constructors

By : Celik Marberd
Date : March 29 2020, 07:55 AM
seems to work fine [class.base.init]/6 is fairly clear in how to delegate constructors, and it cannot be done in the body of the constructor.
An example
code :
#include <iostream>

struct A
    A() : a(42) {}
    A(int) : A() {}

    int a = 17;

struct B
    B() : b(42) {}
    B(int) { B(); }

    int b = 17;

int main()
    A a{0};
    B b{0};
    std::cout << a.a << " " << b.b << std::endl;
$ ./a.out
42 17
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