Introduction To Java Programming Language
Java is a class-based object-oriented programming language and is mostly used for developing applications that can operate on any Operating System and has strong security facilities. It was created by Sun Microsystems which is now owned by Oracle and it was launched in 1995. Java is built on the principle of “Write once, Run anywhere” (WORA); however, compiled byte code will run on any platform that can support JVM.
Core features of Java
Object-oriented: The basic unit in Java is the class and a class defines an object, which is a combination of data – field or attribute and action – method. This makes the code more reusable and modular and easier to maintain at the same time.
Platform Independence: Java enjoys a strategic feature of compilation into bytecode and execution through the JVM, which enables the program to run on different systems without fragmentation.
Robust: Some of the elements such as exception handling, automatic garbage collection, and strong types greatly reduce the chances of run-time errors and make the code more reliable.
Secure: Java has provisions for enhancing security such as bytecode checks, magnificence loaders, and security managers against malicious code.
Simple: Java’s syntax is easy and clean to analyze, making it accessible to programmers with specific backgrounds.
High performance: while not as speedy as low-level languages, Java offers proper performance through just-in-time compilation and optimized bytecode.
Multi-threaded: Java helps multithreading, allowing concurrent execution of a couple of obligations inside an application.
A simple Java Program
public class Main {
public static void main(String[] args) {
System.out.println("Hello World");
}
} Hello World
Explanation
This code defines a public class named ‘Main’ serving as the program’s container. Within this class, the ‘main’ method acts as the program’s entry point. This method, declared as static and void, takes a string array ‘args’ as input but doesn’t return any value. The core functionality is to print the message “Hello, World!” to the console using the System.out.println() statement.
Another example with class object concept
class Calculator {
int add(int a, int b) {
return a + b;
}
}
public class Main {
public static void main(String[] args) {
Calculator calc = new Calculator();
int sum = calc.add(5, 3);
System.out.println("Sum: " + sum);
}
} Sum: 8
Explanation
- Calculator class: Has a single method add that takes two numbers and returns their sum.
- Main class: Creates a Calculator object.
Calls the add method with 5 and 3.
Prints the result.
Summary
Java is a flexible, robust, and comfortable language with big surroundings. Its platform independence, object-oriented paradigm, and robust network support make it a famous choice for organization programs, web development, Android app development, and more. even as it has overall performance and verbosity issues, its advantages regularly outweigh those drawbacks in lots of scenarios.
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