Java in Jars

A collection of files made during the Programming 2 course @ Sapienza

This work is licensed under CC BY-NC-SA 4.0
The license builds on top of Sapienza's Didactic Material Policy. More info at the end of the page

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Introduction

The Programming 2 course I took during my first year at Sapienza was about Object Oriented programming, and the language that was used to teach us this programming paradigm was Java. This is a mere collection of files that explain useful concepts behind the vast world of OOP and Java itself. Each lesson has its own package, for a whopping total of around 20 packages

Lessons' topics

Lesson	Topics	Files
01	How to print Hello World; Creation of methods: how to make and call them; Creation of attributes	HelloWorld.java Sum.java
02	Various operations in Java (+, -, * and /); Creation of objects; Meaning of the static keyword	Counter.java Lesson02_Main.java Static.java
03	Concept of encapsulation and use of the private keyword; Use of arrays to implement stacks; Handling of exceptions; Use of the throws keyword; Use of the try {...} catch (Exception) {...} block; Creation of new exceptions	ArrayStack.java ArrayStack2.java EmptyStackException.java Encapsulation.java FullStackException.java Lesson03_Main.java
04	Implementation of linked lists; Introduction of the null value; The this object	EmptyStackException.java IntList.java Lesson04_Main.java ListStack.java
05	Introduction to subclasses; Use of this and super to respectively call the subclass' or the super class' constructor; Concepts of inheritance, overloading and overriding; Concept of polymorphism: methods are treated dynamically, while attributes are treated statically	FirstClass.java Lesson05_Main.java SecondClass.java
06	Packages, interfaces, abstract classes and methods, access modifiers (each topic is explained in a different package)	Lesson06_Main
	Introduction to packages (1/2); Extendability of packages through other packages	Package01 SuperPowers.java TestPackage01Class.java
	Introduction to packages (2/2); Access modifiers (public, package-private (or default), protected and private)	Package02 Powers.java TestPackage02Class.java
	Application of inheritance in packages; Dynamicity of this and staticity of super	Package03 ClassOne.java ClassTwo.java ClassThree.java TestPackage03Class.java
	Introduction to interfaces and abstract classses; Concrete methods against abstract methods; Concepts of variable	Package04 IntegerVar.java IntegerVar_01.java IntegerVar_02.java ReadableInteger.java WritableInteger.java TestPackage04Class.java
07	Further examples of abstract classes and introduction of abstract methods; Static fields	Benchmark.java Children.java ConcreteBenchmark.java Lesson07_Main.java
08	Interfaces: fields, static and default interface methods; Inheritance of default methods for multiple interfaces; Inner classes, inner and outer objects; Scopes; Local classes	Clash.java Interface1.java Interface2.java Lesson08_Main.java ReverseStack.java Stack.java State.java TestLocalClasses.java
09	Generics: implementation of GenericList; Identities: differences between == and equals()	GenericIdentity.java GenericList.java IntList.java Lesson09_Main.java
10	Generics: raw types, covariance and contravariance; Wildcard: use of ? for indicating any type	ClassOne.java ClassTwo.java ClassThree.java Generics.java GenericsOne.java GenericsTwo.java Lesson10_Main.java WildcardTest.java
11	Anonymous classes: implementation by extending classes and by implementing interfaces; Functional interfaces; Lambda expressions for replacing anonymous classes; Closures	Closures.java Functio.java FunctioTest.java LambdaTest.java Lesson11_Main.java MyReadable.java Readable.java TestAnonymous.java
12	Introduction to Threads and Runnables; Implementation of delay() and run() methods; Use of lambda expressions for creating a run() method	CompulsiveWordPrinter.java Lesson12_Main.java SleepyWordPrinter.java ThreadTest.java WordPrinter.java
13	Threads: concept of locks and monitors; Implementation of synchronized methods or blocks; Concept of deadlock	ArrayStack.java AThreadMess.java DeadLock.java DeadManWarning.java Lesson13_Main.java NamedThread.java NamePrinter.java Popper.java TestPrinter.java
14	Preference of synchronized inside the method's declaration rather than inside the method itself; Implementation of ArrayStacks with threads; Methods wait(), notify() and notifyAll()	BadStackImplementation.java GoodStackImplementation.java Lesson14_Main.java Popper.java Pusher.java Stack.java TestStack.java YesWeCan.java

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Licensing

I do not own the original files: in fact, they are the lecture materials provided by professor P. Cenciarelli. My work consisted in readapting them into a more readable format, including extra and more verbose comments, explining what was happening in the code. The CC license exists on top of Sapienza's original Content Policy, but clearly the owner of the files (so professor Cenciarelli) dictates which policy is enforced on his material. Hence, the CC license acts only as a mere protection on my readaptation of his content. If needed, I can readapt the license, or even remove it. If you are the owner of these files, feel free to contact me if needed.