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


The next principle of OOP we will discuss is called overloading. Overloading is a powerful concept in OOP that allows us to reuse method names as long as they have different signatures. A method signature is the method name, its parameters, and the order of the parameters:

Figure 4.7: Representation of a method signature

The preceding is an example of a method that withdraws funds from a given bank name. The method returns a double and accepts a String parameter. The method signature here is the name of the getMyFundsFromBank() method and the String parameter bankName. The signature doesn't include the return type of the method, only the name and the parameters.

With overloading, we are able to define more than one method with the same method names but different parameters. This can be useful in defining methods that do the same thing but take different parameters.

Let's look at an example.

Let's define a class called Sum with three overloaded methods that add the parameters that...