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Sep 22, 2010 · The super keyword in Java is a reference variable that is used to refer to the immediate parent class object. Usage of Java super Keyword. super can be used to refer to the immediate parent class instance variable. super can be used to invoke the immediate parent class method. super () can be used to invoke immediate parent class constructor.
Aug 31, 2016 · If you use super in a class it usually refers to the ancestor of that class (either the extend ed class or Object). In the case of overriden default method of an interface you have to specify the specific interface which default implementation you want to invoke, hence. <Interface>.super.<method>(); See also The diamond problem.
Nov 14, 2013 · Java 8 interfaces introduce some aspects of multiple inheritance. Default methods have an implemented function body. To call a method from the super class you can use the keyword super, but if you want to make this with a super interface it's required to name it explicitly. class ParentClass {. public void hello() {.
Even if String fits in Object (which is a super class of Number) you woudln't be sure to be able to add a Number to a List that contain any subclass from one of the super classes of Number) super doesn't mean any subclass of one of the super classes, it only means one of the super classes.
Oct 26, 2010 · 9. this refers to a reference of the current class. super refers to the parent of the current class (which called the super keyword). By doing this, it allows you to access methods/attributes of the current class (including its own private methods/attributes).
Feb 25, 2009 · Whilst when calling super.super.method(), you want to break your own obedience agreement. You just cannot cherry pick from the super class. However, there may happen situations when you feel the need to call super.super.method() - usually a bad design sign, in your code or in the code you inherit !
Nov 4, 2010 · You may also use the super keyword in the sub class when you want to invoke a method from the parent class when you have overridden it in the subclass. Example:
Jun 16, 2015 · super( "title" ) can only be called as the first line of a constructor. It is not a method call. It calls a specific constructor in the super class, constructs that object, then continues with your constructor code. This is the way all constructors work. If you don't specify a constructor, the no-argument constructor (super()) is called ...
Oct 29, 2013 · 8. It means that the type T must implement Comparable of T or one of its super classes. For example, if A extends B, if you want to use SortedList<A>, A must implement Comparable<A> or Comparable<B>, or in fact just Comparable. This allows the list of A s to be constructed with any valid comparator. answered May 13, 2010 at 14:39.
Aug 13, 2012 · protected void foo() { // This doesn't work, I get the following compile time error: // Constructor call must be the first statement in a constructor super().super().foo(); } EDIT Some Context Info: Class B is an actual class we use. Class C is a unit test class, it has some modifications.
