It is mostly said that running a program is not possible without the main() method. In most colleges and institutes and organizations, teachers and interviewers asked if it is possible to execute a Java program without main(). The answer should be Yes. You might have noticed that Java applets do not have main() but run on browsers.
WORA, which is abbreviated as Write Once Run Anywhere, is the feature applicable to those programs which hold the capability to execute itself on any operating systems or any machine. Sun Microsystem gave this terminology for their programming language - Java.
In Java programming, a just-in-time (JIT) compiler is additionally given, as it has the capability to convert the bytecode of Java to the instruction, which can be feed straight to your processor. It starts running just once your program starts and compiles your source code on the fly (hence termed as just-in-time).
Though most of the readers are unaware of the fact that there is a minor difference between Object-oriented Language and Object-based language. All programming languages that are Object-based Languages are not supposed to have the qualities of Object-oriented Language.
In Java language, a static keyword is implemented to make a class-level variable. Hence variables and methods having the keyword static act as part of the class and not as the class instance. static keyword can be used with a variable of any class. These types of variables do not belong to the object (or you can call it an instance of your class).
A Java virtual machine is an essential component that performs special types of tasks. Loading of code Verification of code Executing the code Providing a runtime environment for the users All these functions take different forms of the memory structure. […]
Java programmers must understand the differences between JDK, JVM, and JRE. So let's discuss them briefly. JDK JDK is abbreviated as Java Development Kit, which has a physical existence. It can be considered as a kit inside which resides the JRE […]
Classes and objects from the essential part of Object-oriented programming, where a class can be considered as a construct that encapsulates a group of variables and methods; whereas, an object acts as member or instance of that class.
Overloading and overriding both fall under the concept of polymorphism, which is one of the essential features of OOP. There is a significant difference between Method Overloading and Method Overriding in Java.
Data Abstraction and Data Encapsulation both of these features are considered as the pillars of object-oriented programming language, but they have different functionality and implementation mechanism.
Both abstract class and interface are the major components of the Java language. Both these techniques are used for hiding the implementing part and exposing the functionality part of a program to its users.
In Java, deadlock is a situation that arises in the multithreading concept. This situation may appear in cases where one of your thread is waiting for an object lock, which is acquired by another thread and the second thread waiting for object lock acquired by the first one.