Jun 11, 2012 · Correct use of 'extend' class in java. 0. Class extending another issue? 0.

May 31, 2012 · A class only "extends" a class. Likewise, an interface can extend another interface. A class can only extend one other class. A class can implement several interfaces. If instead you are more interested in knowing when to use abstract classes and interfaces, refer to this thread: Interface vs Abstract Class (general OO)

Jun 24, 2011 · public class BaseClass { public void start() { // do something } } public class ClassA extends BaseClass { } ClassA c = new ClassA(); c.start(); In the following code I want to use the start() method as it was defined in the super class, I have seen in a lot of other developer's codes that they override the method in the super class and then ...

And there is a certain order of elements when you attempt to declare a class in Java: Modifiers such as public, private, etc. The class name, with the initial letter capitalized by convention. The name of the class's parent (superclass), if any, preceded by the keyword extends. A class can only extend (subclass) one parent.

Feb 14, 2014 · List<java.awt.List> array; // you have to import java.util.List, but can't also import java.awt.List Extending. When you extend in Java you are saying that the subclass is a type of the original class. That's the most important aspect you have to be aware of when using extends.

Jun 23, 2015 · My activity must extend Fragment, which means I absolutely need getView(), which won't work if it's inside the inner class, and the code in there is where I need to use code from ListActivity, so I can't extend twice, OR do an inner class in this example.

Dec 7, 2011 · In Java generics, the ? operator means "any class". The extends keyword may be used to qualify that to "any class which extends/implements Something (or is Something ). Thus you have "the Class of some class, but that class must be or extend/implement Something ".

In java, say I have the following class: public class A{ protected class B{ } } can I extend the inner class by doing the following? public class C extends A{ protected class D extends B{ ...

Apr 6, 2012 · I have the capability to extend a class at compile time, but I need to be able to create an instance of this subclass at runtime using an instance of the superclass that was already instantiated. This should be possible in theory because superclass constructors are already called before the subclass constructor.

Jan 13, 2010 · hei. the language is java. i want to extend this class which the constructor has parameters. this is the main class. public class CAnimatedSprite { public CAnimatedSprite(String pFn, int pWidth, int pHeight) { } } this is the child class