This document provides an introduction to the Java programming language. It discusses Java concepts like object-oriented programming, the Java Virtual Machine, primitive data types, variables, control flow, classes and objects, inheritance, interfaces, exceptions, collections, multithreading, design patterns, and more. It also includes code examples and references to Oracle's Java documentation for further reading.

1. Mobile
Software
Engineering
L02 – Java Primer
Mohammad Shaker
FIT of Damascus - AI dept.
MohammadShakerGtr@gmail.com
Mobile SE – August 2012

2. IDE
eclipse, netbeans, etc.

3. eclipse

4. eclipse Juno, 2012

5. btw, why eclipse?!

6. eclipse Download
http://www.eclipse.org/

7. eclipse Download

8. eclipse Juno – Packages and Projects

9. Java
JVM – Java Virtual Machine

10. Java
Write once, run anywhere

11. Java
everything is an object!
Or is it?

12. Java
everything is an object!
Or is it?

13. API
http://java.sun.com/javase/6/docs/api/
Tutorial
http://java.sun.com/docs/books/tutorial/java/TOC.html

14. Variables - Naming
• Subsequent characters also can be numbers
• Case sensitive
• No spaces
• Examples:
name
firstName
phoneNumber

15. Reserved Words
abstract continue for new switch
assert*** default goto* package synchronized
boolean do if private this
break double implements protected throw
byte else import public throws
case enum**** instanceof return transient
catch extends int short try
char final interface static void
class finally long strictfp** volatile
const* float native super while
http://java.sun.com/docs/books/tutorial/java/nutsandbolts/_keywords.html

16. Primitive Types
byte
short
int
long
float
double
boolean
char

17. Primitive Types
byte
short
int Everything
long is an
float object?
double
boolean
char

18. Primitive Types
byte
short
int Everything
long is an
float object?
double
boolean
char

19. Objects
String
BigDecimal

20. Arrays
int[] grades;
grades = new int[15];

21. Control flow
if (boolean) {
// perform this code
} else {
// otherwise, run this
}

22. Example on first step!
Car myCar = new Car();

23. Example on first step!
Car myCar = new Car();

24. Example on first step!
Car myCar = new Car();
Car yourCar = myCar;
Point loc = myCar.getLocation();

25. New paradigms
• Stack
• Heap
• Garbage collection

26. Setters and Getters

27. Let’s get our hands dirty

28. Let’s get our hands dirty
Objects

29. Packages vs Namespaces

30. void main(string[] args)

31. Instance vs Class methods
void shootBall(Point point)
static void main(string[] args)

32. Inheritance and Polymorphism
extends, super, @Override

33. Some diff.
protected in a form of package scope not class scope

34. Some diff.
final vs const vs readonly

35. interfaces

36. Interfaces
extends

37. Collections

38. http://docs.oracle.com/javase/tutorial/collections/interfaces/index.html

39. Example
ArrayList<String> arrList = new ArrayList<String>();
arrList.add(“A”);
arrList.add(“AB”);
arrList.add(“ABC”);
arrList.add(“ABCD”);
// using indices
arrList.set(0, arrList.get(1));
arrList.set(1, “foo”);
// out of bound?
arrList.set(9, “bar”);

40. Example
• Suppose an ArrayList A1
• What does the following line mean?
List<String> list =
new ArrayList<String>(A1);

41. for-each Construct
• Looping by indices
• for-each, parallel execution
for (Object o : collection)
System.out.println(o);

42. Collection Operations
List<Type> list1 = new ArrayList<Type>();
// …
List<Type> list2 = new ArrayList<Type>();
// …
List<Type> list3 = new ArrayList<Type>(list1);
list3.addAll(list2);

43. List Algorithms
• sort — sorts a List using a merge sort algorithm, which provides a
fast, stable sort. (A stable sort is one that does not reorder equal
elements.)
• shuffle — randomly permutes the elements in a List.
• reverse — reverses the order of the elements in a List.
• rotate — rotates all the elements in a List by a specified distance.
• swap — swaps the elements at specified positions in a List.
• replaceAll — replaces all occurrences of one specified value with
another.
• fill — overwrites every element in a List with the specified value.
• copy — copies the source List into the destination List.
• binarySearch — searches for an element in an ordered List using the
binary search algorithm.
• indexOfSubList — returns the index of the first sublist of one List that
is equal to another.
• lastIndexOfSubList — returns the index of the last sublist of
one List that is equal to another.
See more @ http://docs.oracle.com/javase/tutorial/collections/interfaces/list.html

44. Iterators

45. Multithreading
synchronized, wait,
notify, notifyall

46. Exception Handling, IO...

47. Design Patterns
Singleton, Factory, Proxy, Template.. etc.

48. Gang of four

51. Implementing Singleton with Java
“live”

53. Thx for listening