Gain insights into Java essentials, including programming paradigms, objects, data types, and algorithms. Delve into extensive exercises to prepare for a software development career.

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This course is your detailed guide to the fundamentals of the Java programming language. This course will get you on the fast track to becoming a proficient and modern Java developer.

In this course, you will start by covering different programming paradigms like object-oriented and procedural programming. You will then cover the fundamentals of programming in Java such as: objects and data types, variables, arrays, and conditional statements.

In the latter half of the course, you will cover iterative constructs, useful algorithms, and data structures. With over 100 problems, 11 quizzes, and 9 challenges, this course will get you prepared for a career in software development.

A Complete Guide to Java Programming

# Evolution of `Scanner` class

We have seen before how to take input from the users. How to use the `Scanner` class is not completely new to us. However, we need to further investigate this matter for one reason.


Our goal is to create software that is interactive. In that regard, the Scanner class is the latest development that helps us write less code. Before that, we used `InputStreamReader`. It reads bytes and turns them to characters. The `read()` method of `InputStreamReader` invokes the reading of bytes from the underlying byte-input stream. 
We increase the efficiency of `InputStreamReader` by wrapping the new `InputStreamReader` object within a `BufferedReader` object. The constructor of `InputStreamReader` passes one `System.in` object that reads the input from the keyboard. 

Consequently, the process becomes complex. To avoid those complexities, Java has introduced the `Scanner` class through which we can easily take the user’s input. 

# Coding example: 82

The following example shows us those complexities. If you want to rerun the code, write `java main` in the terminal:

Learn how to handle user inputs in a more efficient way using the Scanner class in this lesson.

Java, a High Level Language with a Purpose

How Java Programming Works

Objects and Data Types

Variables: The Name of a Field

Arrays: The Container Objects

Operators and Conditional Statements

Iterative Constructs, Entry and Exit Controlled Loops

Algorithms

Basic Input and Output

Classes and Objects

Interface and Abstraction

Exception Handling and Data Structures

Conclusion

Appendix

Input and Output

Evolution of `Scanner` class

Input and Output

Evolution of Scanner class

Evolution of `Scanner` class