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Java Programming for Beginners
Java Programming for Beginners

Java Programming for Beginners: Learn the fundamentals of programming with Java

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Profile Icon SkillSprints Inc., Mark Lassoff
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€29.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8 (8 Ratings)
Paperback Oct 2017 318 pages 1st Edition
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Arrow left icon
Profile Icon SkillSprints Inc., Mark Lassoff
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€29.99
Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8 (8 Ratings)
Paperback Oct 2017 318 pages 1st Edition
eBook
€8.99 €23.99
Paperback
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Free Trial
Renews at €18.99p/m
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Java Programming for Beginners

Understanding Typed Variables

To create even modest Java programs, we're going to need a way to store and manipulate information. Our chief resource, when doing this, is the variable, and that's what we're going to take a look at in this chapter. We'll look at the different data types in Java and how to use them in our programs. We'll also see the Math class library and one of its functions.

Specifically, we'll walk through the following topics:

  • Introduction to variables and why they're needed
  • Integer variables
  • Floating-point variables
  • The Math class library and its pow() function
  • Character variables
  • The String class and its methods

Integer variables

To begin, let's create a new project in NetBeans. I'm going to call mine Variables, and this time we'll allow NetBeans to create the main class for us so that we can get to coding as quickly as possible. We need to delete all the comments that are created automatically by NetBeans when we create our new project, just to keep everything as readable as possible, then we'll be good to go:

The first computers were little more than calculators, and Java, of course, retains this functionality. For example, Java can evaluate 1+1, which will evaluate to 2, of course. However, Java is pretty complicated and designed to do a lot of different things, so we need to provide context to our commands. Here, we tell Java that we'd like it to print the result of 1+1:

package variables; 
 
public class Variables { 
 
    public static void main(String...

Floating point variables

When we're simply counting and manipulating whole objects, integers are fantastic. However, sometimes we need to deal with numbers in a more mathematical sense, and we need a data type that will allow us to express ideas that are not entirely whole numbers. Floating-point numbers, or floats, are a Java primitive type that allow us to express numbers that have decimal points and fractions. In this section, we'll modify some float and integer variables side by side to see how they are similar and different.

Let's create a new Java project (you know the drill by now) and call it FloatingPointNumbers. Let's start by declaring two variables: one integer (iNumber) and one float (fNumber). As we know, once we've declared these variables, we're free to modify and assign values to them in our Java program later. This time, let me show...

The Math class library

A good portion of our time on any software development project is going to be spent teaching our program to solve the types of problems it would comes across on a regular basis. As programmers, we too will run into certain problems time and time again. Sometimes, we'll need to code our own solutions to these problems and hopefully save them for later use. However, more often than not, someone has run into these problems before, and if they've made their solution publicly available, one of our options is to leverage their solution for our own gain.

In this section, we'll use the Math class library, which is bundled with the JDK to solve some math problems for us. To start this section, create a brand new NetBeans project (I'm going to name it TheMathLib) and enter the main() function. We're going to write a very simple program. Let...

Char variables

Programs that manipulate numbers are all well and good, but quite often, we want to be able to work with text and words as well. To help us do this, Java defines the character, or char, the primitive type. Characters are the smallest entity of text that you can work with on a computer. We can think of them to start off with as single letters.

Let's create a new project; we'll call it Characters.java. We'll start our program by simply defining a single character. We'll call it character1 and we'll assign to it the value of uppercase H:

package characters; 
 
public class Characters { 
    public static void main(String[] args) { 
        char character1 = 'H'; 
    } 
} 

Just as we have to use some extra syntax when defining a floating-point number explicitly, we need some extra syntax when defining a character. To tell Java that...

Strings

Let's talk about strings in Java. To begin, create a new NetBeans project, name it StringsInJava, and enter the main() function. Then, declare two variables: a character called c and String called s. Right away, it becomes clear to us that String is a little different. You'll notice that NetBeans did not choose to color code our String keyword with blue, as it would have done if we were declaring a variable of a primitive type:

This is because String, unlike char, is not a primitive type. String is what we call a class. Classes are the backbone of object-oriented programming. Just as we can declare variables of a primitive type, we can also declare variables of a class, which are called instances. In our program, the variable s is an instance of the String class. Unlike variables of primitive types, instances of a class can contain their own special methodologies...

Summary

In this chapter, we explained what variables are and how important they are for creating better programs. We looked at some of the primitive data types of Java, namely int, long, float, char, and double, in detail. We also saw the String class and two of its manipulation methods.

In the next chapter, we'll look at branching statements in Java.

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Key benefits

  • Learn the basics of Java programming in a step-by-step manner
  • Simple, yet thorough steps that beginners can follow
  • Teaches you transferable skills, such as flow control and object-oriented programming

Description

Java is an object-oriented programming language, and is one of the most widely accepted languages because of its design and programming features, particularly in its promise that you can write a program once and run it anywhere. Java Programming for Beginners is an excellent introduction to the world of Java programming, taking you through the basics of Java syntax and the complexities of object-oriented programming. You'll gain a full understanding of Java SE programming and will be able to write Java programs with graphical user interfaces that run on PC, Mac, or Linux machines. This book is full of informative and entertaining content, challenging exercises, and dozens of code examples you can run and learn from. By reading this book, you’ll move from understanding the data types in Java, through loops and conditionals, and on to functions, classes, and file handling. The book finishes with a look at GUI development and training on how to work with XML. The book takes an efficient route through the Java landscape, covering all of the core topics that a Java developer needs. Whether you’re an absolute beginner to programming, or a seasoned programmer approaching an object-oriented language for the first time, Java Programming for Beginners delivers the focused training you need to become a Java developer.

Who is this book for?

This book is for anyone wanting to start learning the Java language, whether you’re a student, casual learner, or existing programmer looking to add a new language to your skillset. No previous experience of Java or programming in general is required.

What you will learn

  • Learn the core Java language for both Java 8 and Java 9
  • Set up your Java programming environment in the most efficient way
  • Get to know the basic syntax of Java
  • Understand object-oriented programming and the benefits that it can bring
  • Familiarize yourself with the workings of some of Java's core classes
  • Design and develop a basic GUI
  • Use industry-standard XML for passing data between applications
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Length: 318 pages
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Language : English
ISBN-13 : 9781788296298
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Oracle
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Table of Contents

11 Chapters
Getting Started with Java Chevron down icon Chevron up icon
Understanding Typed Variables Chevron down icon Chevron up icon
Branching Chevron down icon Chevron up icon
Data Structures Chevron down icon Chevron up icon
Functions Chevron down icon Chevron up icon
Modeling with Object-Oriented Java Chevron down icon Chevron up icon
More Object-Oriented Java Chevron down icon Chevron up icon
Useful Java Classes Chevron down icon Chevron up icon
File Input and Output Chevron down icon Chevron up icon
Basic GUI Development Chevron down icon Chevron up icon
XML Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Half star icon Empty star icon 3.8
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5 star 37.5%
4 star 25%
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1 star 12.5%
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SBT Jan 11, 2018
Full star icon Full star icon Full star icon Full star icon Full star icon 5
My software course in Java was a little more than I was able to grasp at first. This was an excellent book to refresh and help me remember a lot of what was buried in the catacombs of my brain. I liked the book so much, I bought another copy for my Java Mentor. She liked it so much she recommended it to other students. Great book and the exercises in the book and the code available from the website are an excellent no nonsense way to get you where you need to be, in this very popular computer language.
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Anthony Jul 18, 2018
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awesome product
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Anukul N. Mar 28, 2019
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Best books for behginers...
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christian b. urbina cedillo Dec 27, 2020
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Excelente libro para adentrarse en el mundo de Java
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Doctor Mark Apr 08, 2018
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The download is dated; Oracle has JDK 10 and NetBeans 8. Download NetBeans with JDK 8 works. Also I was looking to do Mandelbrot set. There should be something on graphics more than GUI. Otherwise, a good introduction to the language. I Bing-searched the Oracle web site with questions about classes.
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