Last Updated on March 4, 2024 by
Java Roadmap for Programmers
What is Java?
- Java is a popular programming language.
- It is a multi-platform, object-oriented, and network-centric language that can be used as a platform in itself.
- It is a fast, secure, reliable programming language for coding everything from mobile apps and enterprise software to big data applications and server-side technologies.
Why is it important to learn Java?
- It works on different platforms like Windows, Mac, Linux, Raspberry Pi, etc.
- It is an object oriented language which gives a clear structure to programs and allows code to be reused, lowering development costs.
- It is open-source, secure, fast and powerful with a huge community support (tens of millions of developers).
Java Roadmap
– OOPs
OOP stands for Object Oriented Programming. The main aim of OOP is to bind together the data and the functions that operate on them so that no other part of the code can access this data except that function.
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Pillars of OOPs:-
– Data Types
They specify the size and type of values that can be stored in an identifier. Java language is rich in its data types. The variety of data types available allow the programmer to select the type appropriate to the need of the application.
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– Loops
Loop allows us to execute a statement or group of statements multiple times.READ MORE > Types of Loop:
– Classes and Objects
Class is the blueprint or a template of an object.
Object is the real entity world that has some state and behaviour.
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– Methods
It allow us to reuse the code without retyping the code. In Java, every method must be part of some class that is different from languages like C, C++, and Python.
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– Constructors
It is a special type of method which is used to initialize the object. Every time an object is created using the new() keyword, at least one constructor is called. At the time of calling constructor, memory for the object is allocated in the memory.
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– Keywords
They are also known as reserved words. They are also known as predefined words so they cannot be used as a variable or object name or class name.
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– I/O (Input and Output)
It uses the concept of a stream to make I/O operation fast. The java.io package contains all the classes required for input and output operations.
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– Exception Handling
It is one of the mechanism to handle the runtime errors so that the normal flow of the application can be maintained.
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– Multithreading
By using Multithreading, we can perform many operations together which saves time. Also, threads are independent, so it doesn’t affect other threads if an exception occurs in a single thread.
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– Packages
Packages are used in Java in order to prevent naming conflicts, to control access, to make searching/locating and usage of classes, interfaces, enumerations and annotations easier, etc.
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Above are the things which you should know if you want to learn Java.
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Below are the resources to learn more about Java.
