Book Image

Java Fundamentals

By : Gazihan Alankus, Rogério Theodoro de Brito, Basheer Ahamed Fazal, Vinicius Isola, Miles Obare
Book Image

Java Fundamentals

By: Gazihan Alankus, Rogério Theodoro de Brito, Basheer Ahamed Fazal, Vinicius Isola, Miles Obare

Overview of this book

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.
Table of Contents (12 chapters)
Java Fundamentals


Java has the string data type, which is used to represent a sequence of characters. String is one of the fundamental data types in Java and you will encounter it in almost all programs.

A string is simply a sequence of characters. "Hello World", "London", and "Toyota" are all examples of strings in Java. Strings are objects in Java and not primitive types. They are immutable, that is, once they are created, they cannot be modified. Therefore, the methods we will consider in the following sections only create new string objects that contain the result of the operation but don't modify the original string object.

Creating a String

We use double quotes to denote a string, compared to single quotes for a char:

public class StringsDemo {
    public static void main(String[] args) {
        String hello="Hello World";

The output is as follows:

Figure 6.21: Output of the StringsDemo class

The hello object is now a string and is immutable. We can use delimiters...