Java Basics

What is Java?

Java is a high-level, general-purpose, object-oriented, and secure programming language developed by James Gosling at Sun Microsystems, Inc. in 1991.

Features of Java

• Simple: Java is a simple language because its syntax is simple, clean, and easy to understand. Complex and ambiguous concepts of C++ are either eliminated or re-implemented in Java. For example, pointer and operator overloading are not used in Java.
• Object-Oriented: In Java, everything is in the form of the object. It means it has some data and behavior. A program must have at least one class and object.
• Robust: Java makes an effort to check error at run time and compile time. It uses a strong memory management system called garbage collector. Exception handling and garbage collection features make it strong.
• Secure: Java is a secure programming language because it has no explicit pointer and programs runs in the virtual machine. Java contains a security manager that defines the access of Java classes.
• Platform-Independent: Java provides a guarantee that code writes once and run anywhere. This byte code is platform-independent and can be run on any machine.

• Portable: Java Byte code can be carried to any platform. No implementation-dependent features. Everything related to storage is predefined, for example, the size of primitive data types.
• High Performance: Java is an interpreted language. Java enables high performance with the use of the Just-In-Time compiler.
• Distributed: Java also has networking facilities. It is designed for the distributed environment of the internet because it supports TCP/IP protocol. It can run over the internet. EJB and RMI are used to create a distributed system.
• Multi-threaded: Java also supports multi-threading. It means to handle more than one job a time.

Java "Hello, World!" Program

// Your First Program
class Tech Ocean{
    public static void main(String[] args) {
        System.out.println("Hello, World!"); 
    }
}

Output

Hello, World!