Object is the topmost class in the Java Class hierarchy. There is no Class above Object. All classes in Java are implicitly derived from Object.
Class hierarchy is a term used in Java. It is used for identifying the inheritance hierarchy or the parent class relationships Ex: Public class B extends C { } Public class A extends B { } Here if we take the class hierarchy for class 'A' it would be A
It's part of the language specification that all objects in Java must inherit from Object. Java defines a strict class hierarchy, and enforcing a "super most class" ensures that this ordering is maintained.
The top level class in Java is class Object. Every other class inherits from Object and therefore Object is the top most in the class hierarchy. If you extend a class from Object such as class Animal and further extend Animal with class Dog then the hierarchy is as follows: Object | Animal | Dog Code for this hierachy is as follows: class Animal { } class Dog extends Animal { } We don't need to write class Animal extends Object because every class extends from Object so it does not need to be stated.
The "Object" class is the topmost class in the class hierarchy. Classes inherit directly from this class by default; all classes inherit from Object directly or indirectly.
using javac command and mentioning fully classified class name. Fully classified here means class name along with the package hierarchy in which the class is stored in .java file
The top level class in Java is class Object. Every other class inherits from Object and therefore Object is the top most in the class hierarchy. If you extend a class from Object such as class Animal and further extend Animal with class Dog then the hierarchy is as follows: Object | Animal | Dog Code for this hierachy is as follows: class Animal { } class Dog extends Animal { } We don't need to write class Animal extends Object because every class extends from Object so it does not need to be stated.
First you would have to design the class hierarchy; perhaps on paper and pencil. Then you create the classes so that one depends on another, using the extends keyword.
Because it is one of the most important and widely used inheritance concepts in Java. In multi level inheritance a class directly inherits features from one class and indirectly inherits features form other classes that are in the inheritance hierarchy.
Java source files have the .java extension, compiled Java class files have the .class extension.
You cannot do that. The main method of a java class is the point where the execution begins. You can print messages only after a main method is invoked.
define the data types