Sep 11, 2012 · For example, the standard Java class java.util.LinkedHashSet extends java.util.HashSet. The method add() is overridden in LinkedHashSet. If you have a variable that is of type HashSet, and you call its add() method, it will call the appropriate implementation of add(), based on whether it is a HashSet or a LinkedHashSet. This is called ...

Apr 7, 2017 · In Java 5.0, it introduces a new facility called covariant return type. You can override a method with the same signature but returns a subclass of the object returned. In another words, a method in a subclass can return an object whose type is a subclass of the type returned by the method with the same signature in the superclass.

Oct 1, 2008 · Method overloading means writing two or more methods in the same class by using same method name, but the passing parameters is different. Method overriding means we use the method names in the different classes,that means parent class method is used in the child class. In Java to achieve polymorphism a super class reference variable can hold ...

Jun 19, 2013 · 15.12.2.5. Choosing the Most Specific Method. If more than one member method is both accessible and applicable to a method invocation, it is necessary to choose one to provide the descriptor for the run-time method dispatch. The Java programming language uses the rule that the most specific method is chosen.

With method overloading you're calling "the same method", only with different parameters and/or different output. This makes it easy for you to write methods with the same core functionality but with different input parameters. Example: public int Sum(int a, int b) { return a + b; } public double Sum (double a, double b) { return a + b; }

Java will always try to use the most specific applicable version of a method that's available (see JLS §15.12.2). Object, char[] and Integer can all take null as a valid value. Therefore all 3 version are applicable, so Java will have to find the most specific one.

Jul 23, 2016 · To be simple and concise: Overloading is just a possibility provided by Java (but most of modern and flexible languages use it) (and other languages such as C++ or C#) to allow developers to create for a same method/function name, several of it. Why ? Because method naming is important and method naming should convey the behavior of it.

May 8, 2015 · In Java, resolving methods in case of method overloading is done with the following precedence: 1. Widening 2. Auto-boxing 3. Var-args. The java compiler thinks that widening a primitive parameter is more desirable than performing an auto-boxing operation.

Overloading. Overloading in Java is the ability to create multiple methods of the same name, but with different parameters. The main advantage of this is cleanliness of code. Let's take the String.valueOf method. The overloaded versions of this method are defined as:

Dec 16, 2015 · As of Java 8, you can have an interface provide an implementation of a method, through the use of the default keyword. Therefore a new solution would be to provide a default implementation of both methods which maybe throws an exception, then derive the actual implementation from the default interface.