Sun Microsystems created the high-level programming language Java, which was first made public in 1995. Java is compatible with several operating systems, including Windows, Mac OS, and numerous UNIX variants. This lesson provides a thorough introduction to Java. Students and working professionals who want to become exceptional software engineers, especially those who work in the software development field, Should learn Java.
Everything is an object in Java. Java’s foundation in the Object model makes it simple to extend. Java is compiled into platform-independent byte code rather than platform-specific machine code, unlike many other programming languages like C and C++. The Virtual Machine (JVM) on the platform it is being run on interprets these bytes of code that are distributed around the internet. Java is made to be simple to learn. It would be simple to grasp OOP Java if you understood the fundamentals. Java’s secure feature makes it possible to create virus- and hacker-free systems. Public-key encryption serves as the foundation for authentication methods. When the Java runtime system is present, the Java compiler creates an architecture-neutral object file format that allows the produced code to be run on a variety of processors. Java is portable because it is architecture-neutral and lacks implementation-dependent features in the standard. Java’s compiler is built in ANSI C, a subset of POSIX, with a clean portability boundary. Java focuses mostly on compiling time error checking and runtime checking to get rid of circumstances that are prone to errors.
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What is Method Overriding in Java?
Overriding is a feature that allows a subclass or child class in any object-oriented programming language to offer a specific implementation of a function that is already given by one of its super-classes or parent classes. The term “override” refers to a method in a subclass that replaces a method in a superclass when both methods share the same name, same parameters or signature, and same return type (or sub-type).
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A method that is already existing in the parent class can be overridden to produce a customized implementation of the method. When one class inherits from another class, method overriding happens in both classes. The overriding and overridden methods’ function parameters and method return type must match when overriding. In Java, overriding a method must adhere to a set of requirements. The overriding method and the overridden method must share the same method name, function parameters, and return type. An overriding method’s access modifier cannot be more restrictive than an overridden method’s access modifier. Due to their scope, static, private, and final methods cannot be overridden. If the class is not abstract, it must override all of the abstract methods if it implements an interface or extends an abstract class.
Example of Method overriding in Java:
class Orange
void run(){System.out.println(“I am an Orange”);}
//Creating a child class
class Lemon extends Orange{
void run(){System.out.println(“I am Lemon”);}
public static void main(String args[]){
//creating an instance of child class
Lemon obj = new Lemon();
//calling the method with child class instance
obj.run();
The outcome will be “I am a Lemon”
Constructor Overriding in Java
If the method’s name, return type, and other parameters are the same in the superclass and the subclass, and if you try to call the method using a subclass object. The subclass’s method is then called. Constructor appears to be a method but is not one. Its name is the same as the class name and it lacks a return type. A function Object() { [native code] }, however, cannot be replaced. The compiler considers it as a method, expects a return type, and produces a build time error if you attempt to create a function Object() { [native code] } for a superclass in a sub-class.
Conclusion
Java has a feature called method override that allows a superclass method to rewrite or reimplement a subclass. A method in a child class is said to override a method in its parent class if it shares the same name, same parameters list or signature, and same return type as the method in the parent class.
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