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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.
Jun 28, 2015 · This this refers to the reference to the current instance, also when called like this(arg) it calls the corresponding constructor in the current class. Similarly, when super() is called it calls the corresponding constructor in the super class. They can be called only from a constructor. answered May 22, 2010 at 2:06.
Nov 4, 2010 · CommentedNov 14, 2016 at 22:03. 1. You call super () to specifically run a constructor of your superclass. Given that a class can have multiple constructors, you can either call a specific constructor using super () or super (param,param) oder you can let Java handle that and call the standard constructor.
Nov 6, 2011 · 3. this can be pointing to current object. super can be used for accessing Super class metods & variables. this () can be used to invoke a constructor of the same class. super () can be used to invoke a super class constructor. Difference with examples. edited Nov 6, 2011 at 2:01. chown. 52.5k17137170.
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.
Jun 16, 2015 · Assuming the super type is JFrame means that the class in question implements JFrame. If you type JFrame jf = new JFrame (); into something like eclipse and on mac command+click the word JFrame (on Window control+click [NOT right click]) it will bring you to where JFrame is actually declared in java. – user4920910.
Apr 25, 2014 · 0. I'm again here and I like to extend the question I made today about this and super keywords. Let's take some examples. Example 1. import java.applet.*; public class Main extends Applet {. //overrides Applet.init () public void init () {. //here I use super keyword without creating an istance of the class Applet.
Mar 23, 2014 · super relates not to a specific method, but to the whole parent class instead. That's why your code sample is perfectly correct. 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.
Nov 24, 2015 · In your specific example, since any array of reference type is an Object[] (by Java array covariance), it can therefore be used as an argument to <S super T> S[] toArray(S[] a) (if such bound is legal) at compile-time, and it wouldn't prevent ArrayStoreException at run-time. What you're trying to propose is that given: List<Integer> integerList ...
