(1) What exactly is Java?
Java is the language for high-level, object-oriented, robust, stable programming, platform-independent, high-performance, multithreaded, and portable programming. It was founded in June 1991, by James Gosling. It may also be referred to as the portal because it has its own JRE and API.
(2) What do you mean by virtual machine Java?
Java Virtual Machine is a virtual machine which requires the Java program to run on the device. JVM serves as a run-time engine that calls the Java code to the key process. JVM is the standard that will be added to the operating device. JVM compiles the Java code to be a Bytecode that is machine-independent and similar to the native code.
(3) How does JDK, JRE, and JVM differ?
JDK: JDK for Java Development Kit is an acronym. It is a software development platform that is used to create applets and Java applications. It does happen biologically. It includes JRE + Tools for growth. JDK is an application of any of the Java Platforms given below published by Oracle Corporation:
- Standard Edition Java Platform
- Enterprise Edition Java Platform
- Micro Edition Java Platform
JRE: JRE stands for Java System Runtime. It is JVM enforcing. The Java Runtime Framework is a collection of program resources that are used to create Java applications. The setting is used to establish runtime. It is JVM enforcing. It does happen biologically. It contains a collection of libraries plus other resources JVM uses during runtime.
JVM: JVM is a Java Virtual Machine acronym; it is an abstract system that offers the runtime framework where Java bytecode can be performed. It is a specification that defines the Java Virtual Machine feature. Oracle and other organizations made way for its introduction. Its recognition is known as JRE.
(4) What are the benefits of Java Packages?
Defining packages in Java has different advantages.
- Packages avoid the conflicting names.
- The Package offers easier control over access.
- We can also have the classes hidden, which are not visible outside and used by the package.
- The related classes can be easier to locate.
(5) What is the platform?
A Platform is the hardware or software setting that implements a piece of software in. There are two interface styles, software driven, and hardware dependent. Java offers the Platform and is focused on coding.
(6) What is an object?
The Subject is an object that has certain condition and actions in real time. In Java, Object is a class instance that has the instance variables as the object’s state and the methods as the object’s actions. A class object can be generated through the use of the new keyword.
(7) What is the constructor?
The constructor can be specified as the specific form of method used to initialize an object’s state. Once the entity is instantiated it is called, and the memory is reserved for the object. Every when an entity is generated using the new keyword it is named the class’s default constructor. The constructor’s name would have to be identical to the class name. There must be no clear return form for the constructor
(8) Could we static constructors?
As we know the static context (method, row, or variable) is part of the entity, not the object. Because Constructors are only called when the object is formed, there is no point in staticizing the Constructors. When you attempt to do so, though, the compiler may display the error in the code.
(9) What is the Inheritance?
Inheritance is a process by which one entity acquires all the property and actions of another entity in a certain type. This is used in Software Reusability and Overriding Procedure. The concept behind inheritance in Java is that you should be able to build new classes based on current ones. Upon inheriting from an established entity, you can reuse parent entity methods and fields. You will also add new methods and fields to the existing class as well. Heritage reflects the connection between the IS-A and is also regarded as a connection between parent and infant.