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The Java world

From: Foundations of Programming: Fundamentals

Video: The Java world

The next language we're going to take a look at is Java. This is heavily influenced by C, but came along over 20 years later. This was released in 1995 and was developed by Sun Microsystems. It is an enormously object-oriented language. It's all about classes and objects and it comes with an enormous library called the Java Class Library. Effectively meaning a whole bunch of prewritten code that you don't have to write. There is an enormous amount of functionality already in there for you.

The Java world

The next language we're going to take a look at is Java. This is heavily influenced by C, but came along over 20 years later. This was released in 1995 and was developed by Sun Microsystems. It is an enormously object-oriented language. It's all about classes and objects and it comes with an enormous library called the Java Class Library. Effectively meaning a whole bunch of prewritten code that you don't have to write. There is an enormous amount of functionality already in there for you.

It is a high-level language. We don't really have to mess around too much with memory management. It has a built-in garbage collector. Java is a language that uses the hybrid compilation model. It's neither straight compiled nor is it interpreted. It compiles and sends to something called bytecode. One of the reasons for that was the idea of being a very cross-platform language. There was a slogan that Sun used called "write once, run anywhere." Now as it's a partially interpreted language that does mean that people do have to have the interpreter for Java on their machine.

What's called the Java Virtual Machine or JVM. You've almost certainly seen that yourself, that some application on your machine has wanted to install Java. That's probably a good clue that one of the things it's famous for is for desktop applications. You can write a desktop application in Java and have it run on a Mac and have it run on a Windows PC, have it run on a Linux box. Recently, one of the big uptakes in Java was for developing mobile applications that run on the Android platform. So it's a C-based language.

Well, what does it look like? Well, one thing that jumps out is again this word main. This is how we tell a Java program where to begin. Now that seems to be an awful lot going on here. I can see that I have int myInt = 55 line. Once again unlike JavaScript which uses the word var, we have to be specific here. We're using the word int. Not a general variable, but an integer variable. The line that begins System.out.println is how we output the words Hello World! to the screen. But this is an object- oriented language and in Java everything is in a class which is why we have to surround the code that we want in this class HelloWorldApp.

It looks like an awful lot to do, but bear in mind most of the development environment you will use will provide this framework for you. You just have to come in and fill in the gaps. And as I mentioned before, although there is a passing resemblance because of the curly braces, because of the semicolons, Java is not JavaScript. The languages have very little to do with each other. If you're interested in getting started with this language you're probably looking at getting a full IDE, a full development environment for Java.

Two are the most popular are Eclipse and NetBeans and because this language is owned by Sun and developed there java.sun.com is the most authoritative website to go to. Sun is now owned by Oracle. So you may be redirected, but you'll always be able to find a lot of information there on getting started and tutorials and the basics of starting to work with Java.

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This video is part of

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Foundations of Programming: Fundamentals

61 video lessons · 84412 viewers

Simon Allardice
Author

 
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  1. 4m 14s
    1. Welcome
      1m 16s
    2. Making the most of this course
      2m 8s
    3. Using the exercise files
      50s
  2. 22m 11s
    1. What is programming?
      5m 45s
    2. What is a programming language?
      4m 48s
    3. Writing source code
      5m 34s
    4. Compiled and interpreted languages
      6m 4s
  3. 16m 29s
    1. Why JavaScript?
      4m 45s
    2. Creating your first program in JavaScript
      6m 54s
    3. Requesting input
      4m 50s
  4. 31m 38s
    1. Introduction to variables and data types
      5m 16s
    2. Understanding strong, weak, and duck-typed languages
      3m 51s
    3. Working with numbers
      5m 4s
    4. Using characters and strings
      4m 5s
    5. Working with operators
      4m 47s
    6. Properly using white space
      6m 46s
    7. Adding comments to code for human understanding
      1m 49s
  5. 24m 49s
    1. Building with the if statement
      7m 35s
    2. Working with complex conditions
      4m 10s
    3. Setting comparison operators
      6m 59s
    4. Using the switch statement
      6m 5s
  6. 17m 56s
    1. Breaking your code apart
      4m 1s
    2. Creating and calling functions
      2m 57s
    3. Setting parameters and arguments
      6m 7s
    4. Understanding variable scope
      2m 23s
    5. Splitting code into different files
      2m 28s
  7. 13m 32s
    1. Introduction to iteration
      4m 28s
    2. Writing a while statement
      5m 24s
    3. Creating a for loop
      3m 40s
  8. 19m 28s
    1. Cleaning up with string concatenation
      4m 30s
    2. Finding patterns in strings
      8m 3s
    3. Introduction to regular expressions
      6m 55s
  9. 19m 59s
    1. Working with arrays
      5m 47s
    2. Array behavior
      5m 29s
    3. Iterating through collections
      5m 18s
    4. Collections in other languages
      3m 25s
  10. 10m 50s
    1. Programming style
      5m 55s
    2. Writing pseudocode
      4m 55s
  11. 25m 55s
    1. Input/output and persistence
      3m 6s
    2. Reading and writing from the DOM
      8m 11s
    3. Event driven programming
      7m 47s
    4. Introduction to file I/O
      6m 51s
  12. 24m 26s
    1. Introduction to debugging
      5m 57s
    2. Tracing through a section of code
      7m 5s
    3. Understanding error messages
      3m 21s
    4. Using debuggers
      8m 3s
  13. 14m 17s
    1. Introduction to object-oriented languages
      5m 18s
    2. Using classes and objects
      6m 29s
    3. Reviewing object-oriented languages
      2m 30s
  14. 11m 14s
    1. Memory management across languages
      5m 11s
    2. Introduction to algorithms
      4m 2s
    3. Introduction to multithreading
      2m 1s
  15. 29m 20s
    1. Introduction to languages
      1m 42s
    2. C-based languages
      4m 40s
    3. The Java world
      3m 13s
    4. .NET languages: C# and Visual Basic .NET
      6m 17s
    5. Ruby
      3m 4s
    6. Python
      2m 56s
    7. Objective-C
      4m 3s
    8. Libraries and frameworks
      3m 25s
  16. 1m 2s
    1. Where to go from here
      1m 2s

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