Getting Starts Basic java for Android Developer

1. Basic JAVA
for Android Development
Nattapong Tonprasert

2. Reference
• Head First Java, O'Reilly

3. Introduction

4. The Way Java Works

5. Installation Java Platform (JDK)
• Download : http://www.oracle.com/technetwork/
java/javase/downloads/index.html

6. Look how easy it is to write java

7. Look how easy it is to write java

8. Code structure in Java

9. Code structure in Java
source file
class file
method 1
statement
method 2
statement

10. Code structure in Java
public class Dog {
!
!
!
!
}
class
public class Dog {
void bark () {
!
!
}
}
method
public class Dog {
void bark () {
statement1;!
! ! statement2;
}
}
statements

11. Anatomy of a class

12. Writing a class with a main
public class MyFirstApp {
!
public static void main (String[] args) {
System.out.println("I Rule!");
System.out.println("The World!");
}
}

13. Statements
int x = 3;
String name = "Dirk";
x = x * 17;
System.out.print("x is " + x);
double d = Math.random();
// this is a comment

14. Condition
if (x == 10) {
System.out.println("x must be 10");
} else {
System.out.println("x isn't 10");
}
!
if ((x < 3) && (name.equals("Dirk"))) {
System.out.println("Gently");
}
!
if ((x < 3) || (name.equals("Dirk"))) {
System.out.println("Gently");
}

15. Looping
while (x > 12) {
x = x - 1;
System.out.println("x is " + x);
}
!
for (x = 0; x < 10; x = x + 1) {
System.out.println("x is " + x);
}

16. Classes and Objects

17. Classes and Objects

18. Classes and Objects

19. Classes and Objects

20. thinking about objects
When you design a class, think about the objects that
will be created from that class type. Think about
• things the object knows
• things the object does

21. thinking about objects

22. What’s the difference between a class
and an object?
• A class is not an object (but it’s used to construct
them)
• A class is a blueprint for an object

23. Encapsulation
• public
• private - self class
• protected - self package

24. Class GoodDog
class GoodDog {
private int size;
public int getSize() {
return size;
}
public void setSize(int s) {
size = s;
}
void bark() {
if (size > 60) {
System.out.println("Woof! Woof!");
}
else if (size > 14) {
System.out.println("Ruf! Ruf!");
}
else {
System.out.println("Yip! Yip!");
}
}
}

25. GoodDog Test Drive
public class GoodDogTestDrive {
public static void main (String[] args) {
GoodDog one = new GoodDog();
one.setSize(70);
GoodDog two = new GoodDog();
two.setSize(8);
System.out.println("Dog one: " + one.getSize());
System.out.println("Dog two: " + two.getSize());
one.bark();
two.bark();
}
}

26. Static variables

27. Static variables

28. Static variables
class Player {
static int playerCount = 0;
private String name;
!
public Player(String n) {
name = n;
playerCount++;
}
}
!
public class PlayerTestDrive {
public static void main(String[] args) {
System.out.println(Player.playerCount);
Player one = new Player("Tiger Woods");
System.out.println(Player.playerCount);
}
!
}