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Design patterns are solutions to commonly recurring problems. Design patterns are classified into Creational, Structural, and Behavioural types.&nbsp; Factory Method Design Pattern is a creational design pattern that means it deals with the creation of objects. It says that, define an interface for creating the object and let the subclasses decide which class to instantiate.&nbsp; Steps to implement Factory Method Design Pattern 1. Create an interface having an abstract method 2. Create implementation classes 3. Create a Factory that will decide which imp object will be created. 4. Test in the main method So in this video, let's look at the detailed explanation of the Factory Method Design Pattern.

Factory Method Design

In this video, we will be learning how to resolve the could not find &amp; load main class error. This error mainly occurs when JVM fails to find or load main class while executing a program.

How to Fix 'Could not find or Load main class error' in Java?

In this video, we will be discussing Constructors from Java in detail.&nbsp;<h2>What are Constructors?</h2>Constructor in Java is a special method that is used to initialize the objects. While creating the object, that time constructor will be called. Constructor can be used to set the initial values of an object.&nbsp;<h2>Rules for writing constructors:&nbsp;</h2>1. Class name and constructor name must be the same.&nbsp; 2. A constructor in Java can not be abstract, final, static, or Synchronized.&nbsp; 3. Access modifiers can be used in the constructor to control its access.&nbsp;<h2>Types of Constructors in Java:&nbsp;</h2>1. No-argument constructor/Default&nbsp; 2. Parameterized Constructor&nbsp; &nbsp;Constructors in Java <a href="https://www.geeksforgeeks.org/constructors-in-java/">https://www.geeksforgeeks.org/constructors-in-java/</a>

Constructors in Java

In the programming world, there are mainly two types of language available one is Compiled and another one is Interpreted language. As we know Java is an Interpreted language as it’s generating byte code (intermediate) Code after compilation (javac).&nbsp; Then who and when will convert those intermediate codes to Machine understandable code? The answer is Interpreter and JIT compiler and Runtime, they will convert to machine code.&nbsp; So we can say the JIT compiler helps in improving the performance of Java programs by compiling bytecode into native machine code at run time. So in this video, let's deep dive into the Just In Time Compiler (JIT).JIT in Java: <a href="https://www.geeksforgeeks.org/just-in-time-compiler/">https://www.geeksforgeeks.org/just-in-time-compiler/</a>

Just In Time Compiler (JIT) in Java

Java is one of the most popular and widely used programming languages. It has been one of the most popular programming languages for many years. In this article, we will see how to download and install Java on a 64-bit architecture machine.&nbsp;The following steps can be followed in order to download and install java. All the steps are described below has been performed on the Windows 10 operating system, but the procedure is quite similar to other operating systems as well.&nbsp;Step 1: Open https://www.oracle.com/java/technologies/javase-downloads.html url in the browser and it will navigate to the official Oracle Java downloads page.&nbsp;Step 2: Now, scroll to the version of the Java which we want to download and click on JDK Download option as shown below:&nbsp;Step 3: Scroll down to the page and click on the download button option suitable for your computer Operating system. But for a 64-bit machine, choose the software name ending with x64.&nbsp;&nbsp;Related Article : &nbsp;<a href="https://www.geeksforgeeks.org/how-to-download-and-install-java-for-64-bit-machine/">https://www.geeksforgeeks.org/how-to-download-and-install-java-for-64-bit-machine/</a><a href="https://www.geeksforgeeks.org/setting-environment-java/">https://www.geeksforgeeks.org/setting-environment-java/</a>&nbsp;

Installing Java and Setting Up the Environment Variables

A Java class file is a file containing Java bytecode and having .class extension that can be executed by JVM. A Java class file is created by a Java compiler from .java files as a result of successful compilation.&nbsp;As we know that a single Java programming language source file (or we can say .java file) may contain one class or more than one class. So if a .java file has more than one class then each class will compile into a separate class files. For Example: Save this below code as Test.java on your system.Related &nbsp;Article : &nbsp;<a href="https://www.geeksforgeeks.org/java-class-file/">https://www.geeksforgeeks.org/java-class-file/</a>

Java Class File

As we know, Java is an Interpreted language as it’s generating byte code (intermediate) Code after compilation (javac). Then who and when will convert those intermediate codes to Machine understandable code? The answer is Interpreter and JIT compiler and Runtime, they will convert to machine code.&nbsp; So we can say the JIT compiler helps in improving the performance of Java programs by compiling bytecode into native machine code at run time. On the other side, JVM is an engine that provides a run-time environment to run Java applications and it is part of JRE. So in this video, we are going to explain some major differences between JIT and JVM. JIT vs JVM: <a href="https://www.geeksforgeeks.org/difference-between-jit-and-jvm-in-java/">https://www.geeksforgeeks.org/difference-between-jit-and-jvm-in-java/</a>

Difference between JIT and JVM in Java

In java, inheritance is an important OOPs concept, by which one class can acquire all the features of its parent class.&nbsp;There are two keywords provided by Java to achieve inheritance&nbsp; 1. Extends: This keyword is used to extend one class functionality to other, like extending parent class functionality to the child. 2. Implements: Using this keyword a class can implement an Interface. So in this video, we are going to explain some major differences between Extends and Implements.Extends vs Implements in Java: <a href="https://www.geeksforgeeks.org/extends-vs-implements-in-java/">https://www.geeksforgeeks.org/extends-vs-implements-in-java/</a>

Extends vs Implements in Java

For memory management, we mainly use the static keyword in Java. In order to share the same variable or method we use the keyword static. The static keyword is a non-access modifier in Java that is applicable for the following:&nbsp;<ol><li>Blocks</li><li>Variables</li><li>Methods</li><li>Classes</li></ol>Static Blocks: 1) A class can have multiple static blocks 2) The static block gets executed when class is loaded in the memory 3) To initialise the static variable, we use the static block Static Variables: 1) It is a class level variable 2) It's memory allocation takes place when the class is loaded in the memory 3) Also known as class variableStatic Methods: 1) They can access the static variables/class variables without using objectsSyntax: static return_type method_name();Watch the complete video to understand the differences between these three with examples Static keyword in Java: <a href="https://www.geeksforgeeks.org/static-keyword-java/">https://www.geeksforgeeks.org/static-keyword-java/</a>

Static Variable, Static Method & Static Block in Java

An Interface in Java programming language is defined as an abstract type used to specify the behavior of a class. An interface in Java is a blueprint of a class. A Java interface contains static constants and abstract methods.The interface in Java is a mechanism to achieve abstraction. There can be only abstract methods in the Java interface, not the method body. It is used to achieve abstraction and multiple inheritance in Java. In other words, you can say that interfaces can have abstract methods and variables. It cannot have a method body. Java Interface also represents the IS-A relationship.Interfaces (Java Programming): <a href="https://www.geeksforgeeks.org/interfaces-in-java/">https://www.geeksforgeeks.org/interfaces-in-java/</a>

Interfaces (Java Programming)

The break and continue statements are the jump statements that are used to skip some statements inside the loop or terminate the loop immediately without checking the test expression. These statements can be used inside any loops such as for, while, do-while loop.Break: The break statement in java is used to terminate from the loop immediately. When a break statement is encountered inside a loop, the loop iteration stops there, and control returns from the loop immediately to the first statement after the loop. Basically, break statements are used in situations when we are not sure about the actual number of iteration for the loop, or we want to terminate the loop based on some condition.Break Continue _ Java Programming: <a href="https://www.geeksforgeeks.org/break-and-continue-statement-in-java/">https://www.geeksforgeeks.org/break-and-continue-statement-in-java/</a>

Break Continue  Java Programming

The switch statement is a multi-way branch statement. In simple words, the Java switch statement executes one statement from multiple conditions. It is like an if-else-if ladder statement. It provides an easy way to dispatch execution to different parts of code based on the value of the expression. Basically, the expression can be a byte, short, char, and int primitive data types. It basically tests the equality of variables against multiple values. Switch Case _ Java Programming : <a href="https://www.geeksforgeeks.org/switch-statement-in-java/#">https://www.geeksforgeeks.org/switch-statement-in-java/#</a>

Switch Case  Java Programming

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