Software Development Practise 2020 - Topics 
	
	Monday - Tuesday - Wednesday: 11am to 2pm

	short breaks: 11:30 - 12:00 - 12.30 ... 
	
	Online english documents: 
	
	http://skripta.de/java1e

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	Monday May 11th:

	Java basic features:
	
		Difference between Compiler based languages 
		and Framework languages => executable vs. Compiler classcode
		Platform independence => Java Runtime necessary
	
		For Application development: 
		Java Compiler (javac) + Interpreter (java) = SDK / JDK
		Integrated Development Environment (IDE) eg. Eclipse / Netbeans
	
		For Execution only: JRE Java Runtime Environment
	
	=====================================================
	
	Tuesday May 12th:
	
	Internal Memory structure (binary form): 
		
		Data <-> Commands (von-Neumann-principle)
		
		Higher programming languages
		
		Development of programming principles: 
		Web-Apps <-> Local (Standalone)-Application
		
		Application <-> App
	
	Elementary Datatypes:
	
		Variable vs. Constant Data types
	
		Numeric / Character / Boolean
		
		String (Object datatypes)
		
		type-casting
	
		Errors / Mistakes: 
		
		Restricted memory-value-range of minor numeric data types 
	
	==================================================================================
		
	Operators: 
	
		Arithmetic,  Relational, Logical, Increment
	
		Errors / Mistakes:  Division of integral values
			Division by zero
			OR-Operation (right side expression not evaluated) 
			Prefix/Postfix Inkrement or Decrement Operation ( ++a, a++)


	Program control structures: 
	
		Loops ( while, do-while, for )
		
		Alternatives (if - else, switch - case) 
		
		Errors: endless loops,
		switch break,

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	Objects:
	
		Objects / Classes : Difference / Data + Methods
	
		Objectcomponents: Attributes / methods / minimum # = 0 
	
		Constructor: Arguments / Return value / "this"
		
		Object-reference (Stack) <-> object-data (Heap) 
		
		SCOPE of Objects - Visibility / Lifetime
			
		Garbage Collection / finalize() 
	
		Access modifiers - private vs. public

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	Objects (cont'd):
	
		Attributes, Object Datatypes vs. Local Datatypes
		Naming conflicts possible
	
		Object-Datatype String, Methods ... 
		
		Object data reside in Data segment / Heap
		Object methods reside in Code Segment

		Importance of certain operations (=, ==) on References,
		eg. Nulling references or assigning new values
	
		Counting the number of existing Objects by STATIC 
		(increase by constructor, decrease by finalize)
	
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	Class - Relations: 
		
	a) Association: One2One, One2Many ...
	
		No keyword, has to be done by coding
	
		Multiple possibilities: 1:1, 1:* ...
			Containertypes: Array, LinkedList 
		
		"Inner class" - implementation and importance
		
		Difference to SQL-Databases: 
			no Primary key / Foreign key
			instead using objectreferences
		
		Bi-directional association
		
		

 	======================================================

	b) Inheritance 
			
		Creation Process of Objects in an Inheritance hierarchy 
		
		Constructors and their sequence
		
		Access modifiers (private, public, protected)

		Method overwriting		
			Virtual methods, abstract methods, abstract classes
				
		ClassModel (UML, self defined, BlueJ )
		

	=======================================================	
	
	Object Persistence:

		Identity of Objects (LValue - RValue) 
		
			
		Typeconversion
			Up- / Downcast 	/ problems arising in downcast
			Typechecking ( instance of )
			
	
		Storing Objects in application: 
			Container types: Arrays / Vector  
			Static Arrays, dynamic Vector / Arraylist 
			
		Storing Objects in external memory / external Storage / 
			Serialization
			into filesystem / network 
			
		Object relational mapping
	
		
	==========================================================
		
	
	Database Connectivity:

			JDBC-ODBC, proprietary drivers
			How to establish a DB-Connection
			Java commands, Import java.sql.*
			
	
		Example JAVA-JDBC-MySQL

			Modularisation of Java Components (classes)
			Object-Rational Mapping
			Object Identity (Memory address <-> Primary Key)
			

		SQL-commands revisited
			INSERT, SELECT, UPDATE, DELETE