extend « Constructor « Java Class Q&A

1. extends of the class with private constructor    stackoverflow.com

Suppose we have the following code:

class test {
    private test() {
        System.out.println("test");
    }

}

public class One extends test {

 ...

2. java force an extending class    stackoverflow.com

In java, can I somehow force a class that extends an abstract class to implement its constructor with a Object as a parameter? Something like

public abstract class Points{

    //add ...

3. Extending a class; Must I explicitely call the super constructor?    coderanch.com

If you subclass a class that does not have a no-argument constructor, you must also specify an explicit constructor of the subtype (with or without parameters). Let's look at a simpler example: class C { C( int i) { } } Class C meets the criteria above (does not have a no-argument constructor). Let's see what happens if you subclass it. ...

4. Extending class with private constructor.    coderanch.com

class A { private A() {} public void f() { System.out.println("A.f"); } private static class B extends A { public void f() { System.out.println("B.f"); } } public static A create() { return new B(); } } public class TestA{ public static void main(String[] args) { A a = A.create(); a.f(); } }

5. Extending a class with private constructor    coderanch.com

6. can constructors use 'extends'    coderanch.com

7. Run the constructor method of the class that I extended possible?    java-forums.org

Hi! I got a class called AIBrain it got some important stuff in the constructor, and I need it to call when my class Tank is constructed. Problem is that it doesnt. I can't do super.blahblah() because AIBrain extends AbstractAppState.. Anyways, how do I call the contructor method in AIBrain from the contructor in Tank that extends AIBrain?

8. extends class, why does it need another constructor?    java-forums.org

I have a question. I am writing a program and I already have 4 classes that are working well together. Now I wanted to write another class that extends a class I have already written. I am confused, however, because I thought that when you "extend" a class, everything in that class (methods, constructors, variables, etc.) are now part of the ...

9. When extending class do constructors get implemented as well    forums.oracle.com

10. Class with private constructor can be extended or not    forums.oracle.com

11. Extending object, without calling super constructor    forums.oracle.com

12. extending constructors....?    forums.oracle.com

13. How to extend a class with static methods and a private constructor?    forums.oracle.com

You can't subclass a class if it only has a private constructor. Usually this is done for singleton classes (where only one instance is required), or for factory classes, where you call getInstance(...) to get an appropriate class or subclass instance. There are (at least) two ways you can handle this :- 1.Write another class containing the additional methods, to sit ...