Sign In Start Free Trial
Account

Add to playlist

Create a Playlist

Modal Close icon
You need to login to use this feature.
  • Book Overview & Buying Transitioning to Java
  • Table Of Contents Toc
  • Feedback & Rating feedback
Transitioning to Java

Transitioning to Java

By : Ken Fogel
4.8 (6)
close
close
Transitioning to Java

Transitioning to Java

4.8 (6)
By: Ken Fogel

Overview of this book

This comprehensive guide will help non-Java developers already using different languages transition from their current language to all things Java. The chapters are designed in a way that re-enforces a developer’s existing knowledge of object-oriented methodologies as they apply to Java. This book has been divided into four sections, with each section touching upon different aspects that’ll enable your effective transition. The first section helps you get to grips with the Java development environment and the Maven build tool for modern Java applications. In the second section, you’ll learn about Java language fundamentals, along with exploring object-oriented programming (OOP) methodologies and functional programming and discovering how to implement software design patterns in Java. The third section shows you how to code in Java on different platforms and helps you get familiar with the challenges faced on these platforms. In the fourth section, you’ll find out how you can manage and package your Java code. By the end of this Java programming book, you’ll have learned the core concepts of Java that’ll help you successfully transition from a different language to Java.
Table of Contents (23 chapters)
close
close
1
Part 1:The Java Development Environment
5
Part 2:Language Fundamentals
15
Part 3:GUI and Web Coding in Java
19
Part 4:Packaging Java Code

Understanding Collections Framework map structures

The second family of collections is the map family. A map is a data structure in which you add elements to a map with a pair of values. The first value is the key. This is a reference to an object that, depending on the type of map, either implements the Comparable interface—as we saw in the previous section—or overrides the hashCode and equals methods. If the key is a primitive, then we declare it as its wrapper class, and Java will manage the necessary conversion to and from the primitive. The second is the value—a reference to the object you are storing in the map. This class does not need to implement the Comparable interface.

There are three map implementations in Java, which we will now cover.

HashMap

Of all the data types available in Java and most other languages, the fastest performing is the integer. The size of an integer is the same as the word size of the CPU. The JVM is a 32-bit or 4-word...

Unlock full access

Continue reading for free

A Packt free trial gives you instant online access to our library of over 7000 practical eBooks and videos, constantly updated with the latest in tech

Create a Note

Modal Close icon
You need to login to use this feature.
notes
bookmark search playlist download font-size

Change the font size

margin-width

Change margin width

day-mode

Change background colour

Close icon Search
Country selected

Close icon Your notes and bookmarks

Delete Bookmark

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Delete Note

Modal Close icon
Are you sure you want to delete it?
Cancel
Yes, Delete

Edit Note

Modal Close icon
Write a note (max 255 characters)
Cancel
Update Note

Confirmation

Modal Close icon
claim successful

Buy this book with your credits?

Modal Close icon
Are you sure you want to buy this book with one of your credits?
Close
YES, BUY