Topic 1 JAVA Topic 1 Topic 2 JAVA Topic 2 Topic 3 JAVA Topic 3 Exception Handling An exception is a problem that arises during the run time of a program. import java.util.*; import java.lang.*; import java.io.*; class CodeWindow { public static void main (String[] args) { int a=10,b; b=a/0; System.out.println(b); } } Output: Run […]
Topic 1 JAVA Topic 1 Topic 2 JAVA Topic 2 Topic 3 JAVA Topic 3 The topics that are covered in this article:1. Inheritance2. Types of Inheritance in Java3. Example of Single Inheritance4. Example of Multilevel Inheritance5. Example of Hierarchical Inheritance6. Order of Constructor Calling7. Method Overriding8. Super in Inheritance9. Super without Inheritance10. Multiple Inheritance
Topic 1 JAVA Topic 1 Topic 2 JAVA Topic 2 Topic 3 JAVA Topic 3 How to Print a Welcome message in JAVA? What is the difference between print, printf and println? package CodeWindow; public class Introduction { public static void main(String[] args) { System.out.println("Welcome to CodeWindow"); /* * System.out.println() * It will print the
Using final to Prevent Overriding While method overriding is one of Java’s most powerful features, there will be times when you will want to prevent it from occurring. To disallow a method from being overridden, specify final as a modifier at the start of its declaration. Methods declared as final cannot be overridden. The following
While the examples in the preceding section demonstrate the mechanics of method overriding, they do not show its power. Indeed, if there were nothing more to method overriding than a namespace convention, then it would be, at best, an interesting curiosity, but of little real value. However, this is not the case. Method overriding forms
If subclass (child class) has the same method as declared in the parent class, it is known as method overriding in Java. Usage of Java Method Overriding Method overriding is used to provide the specific implementation of a method which is already provided by its superclass. Method overriding is used for runtime polymorphism Rules of
In this type of inheritance one class inherits from more than one parent class. Multiple inheritance are not allowed here, in that case, it causes ambiguity error. If we create an object in C, the methods and properties of A and B will inherit in C class. So when we call it will get confused,
A reference variable of a superclass can be assigned a reference to any subclass derived from that superclass. You will find this aspect of inheritance quite useful in a variety of situations. For example, consider the following: Here, weightbox is a reference to BoxWeight objects, and plainbox is a reference to Box objects. Since BoxWeight
Superclass variable can reference a subclass variable in java Read More »
Inheritance is the process by which objects of one class can link and share some common properties of objects from another class. Use of inheritance : For Method Overriding (so runtime polymorphism can be achieved). For Code Reusability. Syntax of inheritance : The extends keyword indicates that you are making a new class that derives
