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java Programming Glossary: superclassInterview : Can we instantiate abstract class? http://stackoverflow.com/questions/13670991/interview-can-we-instantiate-abstract-class class type and all the instance variables declared in each superclass of the class type including all the instance variables that..
What is a difference between <? super E> and <? extends E>? http://stackoverflow.com/questions/1368166/what-is-a-difference-between-super-e-and-extends-e so the collection has to have an element type of E or a superclass . As an example suppose you have a class hierarchy like this..
'Must Override a Superclass Method' Errors after importing a project into Eclipse http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips correctly causing the error ' The method must override a superclass method '. It may be noteworthy to mention this is with Android.. argument of another method java android eclipse override superclass share improve this question Eclipse is defaulting to Java.. @override could only be applied to methods overriding a superclass method. Go to your project ide preferences and set the Java..
Why doesn't Java allow overriding of static methods? http://stackoverflow.com/questions/2223386/why-doesnt-java-allow-overriding-of-static-methods different behaviors for the same methods defined in the superclass and overridden in the subclasses . A static method is not associated..
How to properly override clone method? http://stackoverflow.com/questions/2326758/how-to-properly-override-clone-method implement a deep clone in one of my objects which has no superclass. What is the best way to handle the checked CloneNotSupportedException.. the checked CloneNotSupportedException thrown by the superclass which is Object A coworker advised me to handle it the following..
Can an abstract class have a constructor? http://stackoverflow.com/questions/260666/can-an-abstract-class-have-a-constructor extends Product public TimesWhat int what super what The superclass Product is abstract and has a constructor. The concrete class..
What is a raw type and why shouldn't we use it? http://stackoverflow.com/questions/2770321/what-is-a-raw-type-and-why-shouldnt-we-use-it type member of a raw type R that is not inherited from a superclass or superinterface of R . Here's an example to illustrate public..
How can I add to List<? extends Number> data structures? http://stackoverflow.com/questions/2776975/how-can-i-add-to-list-extends-number-data-structures new ArrayList Integer error Integer is not superclass of Number List super Number listSuperNumber_ListDouble new ArrayList.. new ArrayList Double error Double is not superclass of Number List Integer listInteger_ListNumber new ArrayList.. new ArrayList Double error Double is not a superclass of Integer listNumber_ListNumber.add 3 ok allowed to add Integer..
How do I call one constructor from another in Java? http://stackoverflow.com/questions/285177/how-do-i-call-one-constructor-from-another-in-java 1 public Foo int x this.x x To chain to a particular superclass constructor instead of one in the same class use super instead..
Use of Java [Interfaces / Abstract classes] http://stackoverflow.com/questions/2869222/use-of-java-interfaces-abstract-classes simply a personal choice. java interface abstract class superclass share improve this question You can think of an interface..
What's wrong with overridable method calls in constructors? http://stackoverflow.com/questions/3404301/whats-wrong-with-overridable-method-calls-in-constructors If you violate this rule program failure will result. The superclass constructor runs before the subclass constructor so the overriding.. read of field method called from constructor of superclass On object construction with many parameters Constructors with..
http://stackoverflow.com/questions/3847162/java-generics-super-keyword logic could prove the opposite String is Object Object is superclass of Number. So String should work. I know this is crazy but isn't..
http://stackoverflow.com/questions/499437/in-java-when-should-i-create-a-checked-exception-and-when-should-it-be-a-runti me write cleaner code one layer up since I can catch the superclass and only deal with the individual subclasses when it really..
Why is super.super.method(); not allowed in Java? http://stackoverflow.com/questions/586363/why-is-super-super-method-not-allowed-in-java error. I just had the idea and like to discuss it. java superclass share improve this question It violates encapsulation. You..
http://stackoverflow.com/questions/10134571/covariant-return-type-in-java java.util.ArrayList import java.util.List abstract class SuperClass abstract public List String getList final class SubClass extends.. public List String getList final class SubClass extends SuperClass private List String list null @Override public ArrayList String.. public class Main public static void main String args SuperClass s new SubClass List String list s.getList for String str list..
Using superclass to initialise a subclass object java http://stackoverflow.com/questions/10177523/using-superclass-to-initialise-a-subclass-object-java superclass to initialise a subclass object java SuperClass object new SubClass Why use a superclass to instantiate a subclass.. You may have a method that only takes an instance of SuperClass . Since SubClass is a SuperClass you can use an instance of.. only takes an instance of SuperClass . Since SubClass is a SuperClass you can use an instance of SubClass and treat it as SuperClass..
Classes that don't inherit Object class http://stackoverflow.com/questions/12684305/classes-that-dont-inherit-object-class class Are there any classes that don't inherit Object as SuperClass or maybe have become Obsolete deprecated java object share..
Java Generics: Cannot cast List<SubClass> to List<SuperClass>? http://stackoverflow.com/questions/3246137/java-generics-cannot-cast-listsubclass-to-listsuperclass Generics Cannot cast List SubClass to List SuperClass Just come across with this problem List DataNode a1 new ArrayList..
Java: Calling a super method which calls an overridden method http://stackoverflow.com/questions/4595512/java-calling-a-super-method-which-calls-an-overridden-method method which calls an overridden method public class SuperClass public void method1 System.out.println superclass method1 this.method2.. superclass method2 public class SubClass extends SuperClass @Override public void method1 System.out.println subclass method1.. method call is handled individually so even if you got to SuperClass.method1 by calling super that doesn't influence any other method..
Type erasure, overriding and generics http://stackoverflow.com/questions/502614/type-erasure-overriding-and-generics SubClass has the same erasure as fooMethod Class of type SuperClass but does not override it The method fooMethod Class of type..
'Must Override a Superclass Method' Errors after importing a project into Eclipse http://stackoverflow.com/questions/1678122/must-override-a-superclass-method-errors-after-importing-a-project-into-eclips Override a Superclass Method' Errors after importing a project into Eclipse Anytime..
Java: Non-static nested classes and instance.super() http://stackoverflow.com/questions/2831484/java-non-static-nested-classes-and-instance-super used to invoke an alternate constructor of the same class. Superclass constructor invocations begin with either the keyword super.. are used to invoke a constructor of the direct superclass. Superclass constructor invocations may be further subdivided Unqualified..
Odd situation for “cannot reference this before supertype constructor has been called” http://stackoverflow.com/questions/3383460/odd-situation-for-cannot-reference-this-before-supertype-constructor-has-been-c in Java Puzzlers Puzzle 90 It's Absurd It's a Pain It's Superclass The snippet given is the following public class Outer A class..
Does subclasses inherit private fields? http://stackoverflow.com/questions/4716040/does-subclasses-inherit-private-fields back I found in javadoc next quote Private Members in a Superclass A subclass does not inherit the private members of its parent..
http://stackoverflow.com/questions/5306835/casting-objects-in-java what it means to cast objects in Java. Say you have... Superclass variable new Sublclass object Superclass variable .method What.. Say you have... Superclass variable new Sublclass object Superclass variable .method What is happening here Does the variable type..
Java Generics: Accessing Generic Type at runtime http://stackoverflow.com/questions/9548779/java-generics-accessing-generic-type-at-runtime SomeType The same can be done for Methods Constructors Superclass extensions implements etc I'm awarding haylem as his post led..
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