Techniques of Java Programming Manuel Oriol, April 5th, 2006 - - PowerPoint PPT Presentation

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Techniques of Java Programming Manuel Oriol, April 5th, 2006 - - PowerPoint PPT Presentation

Feb 18, 2023 212 likes •519 views

Techniques of Java Programming Manuel Oriol, April 5th, 2006 Software Engineering Goal Teach Java to proficient programmers Teach basics and also advanced features Have people read research articles and specifications Software

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Software Engineering

Techniques of Java Programming

Manuel Oriol, April 5th, 2006

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Software Engineering

Goal

  • Teach Java to proficient programmers
  • Teach basics and also advanced features
  • Have people read research articles and

specifications

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Software Engineering

Roadmap

  • Java Basics
  • Eclipse
  • Threads and synchronization
  • Class loading and reflection
  • Java

Virtual Machines

  • Byte-Code and Just-In-Time compilation
  • Java Middleware
  • Java Components

and more...

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Software Engineering

Modus Operandi

  • Assistants: Dr. Lisa Ling, Till G. Bay, Andreas Leitner
  • Lectures:
  • 2 hours lectures on Thursday
  • 1 hour exercise on Wednesday
  • Exercises will be corrected in the exercise lectures, not

graded

  • Written exam: 60% of the grade
  • Project: 40% of the grade
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Software Engineering

Documents

  • Slides - Web
  • Course Abstract - Printed...
  • Articles/Reading material - Web links
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Software Engineering

Java Basics: Part 1 - Java Tools

Manuel Oriol, April 5th, 2006

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Software Engineering

Java

  • O–O language
  • multi-platform
  • type-safe
  • class-based
  • imperative
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Software Engineering

The Big Picture

.java .class .html

javac javadoc java

Virtual Machine Compiler Documentation Generator Byte Code, Program Source Code Documentation

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Software Engineering

Environment Variables

  • PATH
  • CLASSPATH
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Software Engineering

Java Compiler

  • javac *.java
  • arguments are files with extension .java
  • each class has a .class file
  • options:
  • g for debugging
  • verbose
  • cp for classpath
  • d for output directory
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Software Engineering

Java Virtual Machine (JVM)

  • java MyMain
  • arguments is a class name containing main method
  • each class loaded on-demand
  • options:
  • verbose
  • cp for classpath
  • d for output directory
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Software Engineering

Java Documentation

  • javadoc *.java
  • comments /** */ and //
  • options:
  • verbose
  • cp for classpath
  • d for output directory
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Software Engineering

Java Archive

  • jar cvf classes.jar *.class
  • first argument is the target is option f
  • each class loaded on-demand
  • options:

c create the archive v verbose mode f first argument is target file name x extract archive

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Software Engineering

Java Debugger

  • jdb MyMain
  • commands during execution:

stop at MyMain:25 stop in MyMain.myMehtod next step run print

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Software Engineering

Java Basics Part 2 - Language

Manuel Oriol, April 5th, 2006

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Software Engineering

Hello World!

public class HelloWorld { public static void main(String[] args){ System.out.println("Hello World!"); } }

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Software Engineering

Packages

  • Package Names: general.lessGeneral.precise
  • Defines a directory infrastructure
  • Fully Qualified Name
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Software Engineering

Primitive Types

  • Primitive types: int, byte, char, long, short,

boolean

  • comparisons: <,>,==,>=,<=, !=
  • operators: +, -, *, /
  • Equivalent classes: Integer, Byte, Character,

Long, Short, Boolean

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Software Engineering

Reference Types

  • Classes
  • Generic classes
  • Interfaces
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Software Engineering

Class

  • abstract
  • final
  • public

public abstract class MyClass{ }

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Software Engineering

Interfaces

  • Only signature of methods
  • has to be implemented in classes

public interface MyInterface{ ... }

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Software Engineering

Inheritance

  • Single inheritance
  • implementation of interfaces to simulate

multiple inheritance public class MyClass extends Object implements MyInterface{ }

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Software Engineering

Arrays

  • Type []
  • Declared when using variables
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Software Engineering

Generic Classes

  • Classes dependent on another class
  • (Will come back to this)

public class MyClass < E >{ }

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Software Engineering

Variables

  • Local

Variables

  • Instance

Variables

  • Class

Variables

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Software Engineering

Local Variable

  • Declared in the code (no matter the

location)

  • Local to the current block ({})
  • Must be initialized before using them

int a; int b=3; MyClass c; String s=”Hello World!”;

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Software Engineering

Instance Variables

  • Declared the same way as local variables but
  • utside any method
  • final, transient, volatile
  • Visibility:
  • public
  • protected
  • default
  • private

public int a; private int b=3; MyClass c; protected String s=”Hello World!”;

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Software Engineering

Class Variables

  • As instance variables but with static
  • shared by all instances
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Software Engineering

this

  • refers to the current object