trainingbypackt/java-fundamentals

A fast-paced and pragmatic introduction to one of the world's most popular programming languages

Java Fundamentals

Since its inception, Java has stormed the programming world. Its features and functionalities provide developers with the tools needed to write robust cross-platform applications. Java Fundamentals introduces you to these tools and functionalities that will enable you to create Java programs. The book begins with an introduction to the language, its philosophy, and evolution over time, until the latest release. You'll learn how the javac/java tools work and what Java packages are - the way a Java program is usually organized. Once you are comfortable with this, you'll be introduced to advanced concepts of the language, such as control flow keywords. You'll explore object-oriented programming and the part it plays in making Java what it is. In the concluding chapters, you'll get to grips with classes, typecasting, and interfaces, and understand the use of data structures, arrays, strings, handling exceptions, and creating generics. By the end of this book, you will have learned to write programs, automate tasks, and follow advanced courses on algorithms and data structures or explore more advanced Java courses.

What you will learn

• Create and run Java programs
• Use data types, data structures, and control flow in your code
• Implement best practices while creating objects
• Work with constructors and inheritance
• Understand advanced data structures to organize and store data
• Employ generics for stronger check-types during compilation
• Learn to handle exceptions in your code

Hardware requirements

For an optimal student experience, we recommend the following hardware configuration:

• Processor: Intel Core i7 or equivalent
• Memory: 8 GB RAM
• Storage: 35 GB available space
• An Internet connection

Software requirements

You’ll also need the following software installed in advance:

• Operating System: Windows (8 or higher)
• Operating system: Windows 7 or above
• Java 8 JDK
• IntelliJ IDEA

java-fundamentals's Issues

001

Lesson01/ Exercise04/ ProductsOfNos.java Exception

Using Java 8, the current code throws an exception:
Enter the first number Exception in thread "main" java.lang.NullPointerException at Main.main(Main.java:7)

The code is missing 'throws IOException', the same exception is thrown when added to code.

Using Java 17, the exception reads as follows:
Enter the first number: Exception in thread "main" java.lang.NullPointerException: Cannot invoke "java.io.Console.readLine()" because the return value of "java.lang.System.console()" is null at Main.main(Main.java:11)