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Jul 31, 2013 · 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).
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.
Nov 4, 2010 · That's because if you omit a call to the super constructor, the no-argument super constructor will be invoked automatically anyway. Not to say that it's bad style; some people like being explicit. However, where it becomes useful is when the super constructor takes arguments that you want to pass in from the subclass.
Bounding generics with 'super' keyword. However, I still seem to be kind of lost with super keyword: When we declare a collection like that: List<? super Number> list = null; list.add (new Integer (0)); // this compiles list.add (new Object ()); // this doesn't compile. shouldn't it be the opposite - we have a list that contains some objects ...
What is the equivalent c# keyword of super keyword (java). My java code : public class PrintImageLocations extends PDFStreamEngine { public PrintImageLocations() throws IOException { ...
Mar 23, 2014 · 0. The keyword super in java allows you to call a super class's method implementation. This is used where a method is overridden in the current class but the intention is to call the method in super class. e.g. public class Person {. protected String name; public Person(String name) {. this.name = name; }
Apr 30, 2012 · this() and super(), both are the constructors that's why must be the first statement. But we can use both in a program. this(): It is used to call, same class Default or Parametrized Constructor. super(): It is used to call, immediate super/parent class Default or Parametrized Constructor.
Jul 23, 2009 · That's why its necessary to check dependent constructors first which called by either this () or super () in your constructor. If other constructors which called by either this () or super () have a problem so whats point execute other statements because all will fail if called constructor fails.
Apr 25, 2014 · First set: there is no difference, unless you've overriden setSize or setVisible in Main, because super.XXX explicitly will call the method as it is defined in the Frame class. With that said, the convention is to only use super when necessary. So super and this are not so so similar.
Dec 7, 2012 · A static method cannot refer to this or super keywords in anyway. Static class. Java also has "static nested classes". A static nested class is just one which doesn't implicitly have a reference to an instance of the outer class. Static nested classes can have instance methods and static methods. There's no such thing as a top-level static ...
