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Software technology: Java

A guide to Java programming that grows with his tasks. For the participants of the module "Software Technology: Java" of the study processes Information Processing and Media Informatics at the IDH ( I Nstitut for D IGital H Umanities, University of Cologne) and for everyone interested! ?

Work in progress. ? This learning and orientation resource is far from being complete. But that's okay. If you notice that something important is missing or inadequate, then open an issue or wear your own changes!

By the way

Content - jump to the table of contents! ? What is this - or what is it not? ? ‍ Contributing - or: How can I participate here? ? ️ Reading view -if you accidentally ended up in the repository! Glossar - General terminology of programming (important)! ? Link list -further recommended (online) resources! ? Java Naming Conventions ... want to be followed!

Contents

The individual subject areas are briefly summarized here with Schlagworten . The respective heading linked to the document with all content on the corresponding topic.

Entry

Required software

JDK Eclipse IDE Download Installation ...

The programming language Java

Warum Java? Warum nicht? Besonderheiten Java Platform Java Ecosystem Packages Hello World! ...

Eclipse IDE

IDE Warum Eclipse? Workspaces Views Editor Die wichtigsten Funktionen Import Export Console Ausführen von Programmen Automatisch generierter Code ...

Base

"Hello World!" and the main method

Das erste Programm Was ist das alles? main

Packages, package and import

Packages Pakete Paket-Pfade package import

Comments

// inline /* multi-line */

variables

Was ist das? Syntax naming conventions Typisierung ...

Data types

primitive Datentypen komplexe Datentypen byte short int long float double boolean char default-Werte Wrapper-Klassen ...

Casting

Typumwandlung implizit explizit upcast downcast cast-Operator Casting bei komplexen Datentypen ...

Operator

Rechenoperatoren Vergleichsoperatoren logische Operatoren Zuweisungsoperatoren + - * / % ++ -- == != > < >= <= && || = += -= /= *= %= &= |= ...

Strings / strings

die Klasse "String" Literals special characters Unveränderbarkeit von Strings UTF-16 String Formatting ...

Methods

Rückgabewerte Parameter/Argumente return Überlagerung Java ist immer pass-by-value ...

Conditional statements / conditional

if else :? (Ternary-Operator) switch

Grind

while do-while for for-each

Arrays

Datenstrukturen Deklaration Typisierung Initialisierung Array Literals Zugriff Mehrdimensionale Arrays ...

Troubleshooting

Error Exception try catch finally try-with-resources throws ...

Documentation with Javadoc

Wozu? /** @param @return <code></code> best practices ...

Object -oriented programming (OOP)

OOP, classes and objects

Definition Nutzen Beispiele Klasse Objekt Kuchen ...

Objects I: Initialization, members, access

new-Operator Instanzvariablen Instanzmethoden Zugriffs-/Sichtbarkeitsmodifizierer private (default) protected public this Getter Setter Konstruktoren ...

Static members

static Klassenvariablen statische Methoden ...

Inheritance I: Basics

Wozu? Terminologie extends super instanceof-Operator Überschreiben von Methoden ...

final

final finale Variablen finale Klassen finale Methoden Konstanten in Java ...

Objects II: representation, identity, equality

toString() Objekt-Identität Objekt-Gleichheit equals() hashCode() Der Vertrag zwischen equals() und hashCode() ...

Inheritance II: Abstract classes and methods

abstrakte Klassen abstrakte Methoden abstract ...

Inheritance III: Interfaces

Interfaces Erweiterung von Interfaces Default-Methoden Statische Methoden in Interfaces ...

Inner and anonymous classes

Anonyme Klassen Innere Klassen ...

Abstract concepts and advanced

Input / output (i / o)

Streams Buffering Reader Writer Objektserialisierung User-Input über Stdin ...

Data structures

verkettete Listen zweifach verkettete Listen binary Binärbäume binäre Suchbäume siehe auch "Collections Framework"! ...

Iterable and Iterator

Iterable Iterator Bezug zu for-each Implementierung ...

Generics

Was? Wozu? <Syntax> Typsicherheit trotz generischer Programmierung Gültigkeit bei Kompilierung und zur Laufzeit ...

Collections framework

Aufbau List Set Map Objekt-Identität im Kontext von HashMaps/HashSets ...

Enums

Enums ...

Recursion

Um Rekursion zu verstehen, muss man zunächst Rekursion verstehen.

Compare and sort

Comparable Comparator Collections.sort() Sortieralgorithmen ...

Multithreading

Prozess Thread Runnable synchronized volatile ...

Program libraries

Was? Wozu? Wie werden sie eingebunden? Maven Gradle ...

Unit tests

Wozu? Schreiben von Unit-Tests Test-driven-development JUnit ...

Beyond the content of the seminar ...

... go the following topics. However, this does not mean that they are not important. If you want to deepen or add to what you have learned, you can be guided by these recommendations:

Java stream api

? Introduction to java 8 streams (baeldung.com)? The Java 8 stream api tutorial (baeldung.com)? String Operations with Java Streams (baeldung.com)? Java stream api (tutorials.jenkov.com)

Lambda Expressions and Functional Interfaces

? Lambda Expressions (docs.oracle.com)? Java Functional Interfaces (BeginnersBook.com)? Lambda Expressions and Functional Interfaces: Tips and Best Practices (baeldung.com)

Static methods in interfaces

? Static and Default Methods in Interfaces in Java (baeldung.com)? Default and Static Methods in Interfaces in Java 8 (codenuclear.com)

ContriButors

That's all. Until now! How about your contribution ?

Thanks for working on this repository deserve the following hardworking participant (emoji legend):

BKIS ? ? ?	Nicolas David Werner ?	Lelalue ?	Mkamphausen ?	Julian Kamphausen ?	Demirro ?
Valeria Gavrilova ?	jsprings ?	Sandeep Mishra ?

This project follows the All-Contributors specification. Contributions (contributions) of all kinds are welcome and are listed at this point as above!