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1. IT ANDROID APP

2. JAVA SYNTAX AND
GRAMMARS

3. YOUR FIRST PROGRAM

4. BASIC GRAMMARS
About Java programs, it is very important to keep in mind
the following points.
 Case Sensitivity- Java is a case-sensitive
language, which means that the upper or lower case of
letters in your Java programs matter.

5. CASE SENSITIVITY
 Case sensitivity enforces capital or lower case in the
text. For example, suppose you have created three
variables called "endLoop", "Endloop", and "EndLoop".
Even though these variables are composed of the
exact same letters in the same exact order, Java does
not consider them equal. It will treat them all differently.

6. JAVA RESERVED WORD
LIST

7. RESERVED WORD LIST
Reserved words are words that cannot be
used as object or variable names in
a Java program because they're already used
by the syntax of the Java programming
language.

8. LIST OF RESERVED JAVA
KEYWORDS
abstract assert boolean break byte case
catch char class const continue default
double do else enum extends false
final finally float for goto if
implements import instanceof int interface long
native new null package private protected
public return short static strictfp super
switch synchroniz
ed
this throw throws transient
true try void volatile while

9. EXAMPLE:

10. JAVA NAMING
CONVENTIONS

11. JAVA NAMING CONVENTIONS
 A naming convention is a rule to follow as you decide
what to name your identifiers (e.g. class, package,
variable, method, etc.).
 Why Use Naming Conventions?
 Different java programmers can have different styles and
approaches to the way they program. By using standard Java
naming conventions they make their code easier to read for
themselves and for other programmers. Readability of Java
code is important because it means less time is spent trying to
figure out what the code does, leaving more time to fix or
modify it.

12. IDENTIFIERS
A Java identifier is a name given to a
package, class, interface, method, or
variable. It allows a programmer to refer
to the item from other places in the
program.

13. BASIC GRAMMARS
About Java programs, it is very important to keep in mind the
following points.
 Class Names − For all class names the first letter should
be in Upper Case. If several words are used to form a name
of the class, each inner word's first letter should be in Upper
Case.
 Class representing the name of a Java class. This class is
unable to changed, and can therefore be safely used by
multiple threads.
Example: class MyFirstJavaClass

14. CLASS NAME

15. BASIC GRAMMARS
About Java programs, it is very important to keep in mind
the following points.
 Method Names − All method names should start with
a Lower Case letter. If several words are used to form
the name of the method, then each inner word's first
letter should be in Upper Case.
Example: public void myMethodName()

16. METHOD NAME

17. WHAT ARE METHODS?
A method is a set of code which is referred to
by name and can be invoked at any point in a
program simply by utilizing the method's
name.

18. THERE ARE TWO BASIC TYPES OF
METHODS
Built-in: Build-in methods are part of the compiler
package, such as
System.out.println( ) and System.exit(0).
User-defined: User-defined methods are created by you,
the programmer. These methods take-on names that you
assign to them and perform tasks that you create.

19. BASIC GRAMMARS
About Java programs, it is very important to keep in mind
the following points.
 public static void main(String args[]) − Java
program processing starts from the main() method
which is a mandatory part of every Java program.

20. EXAMPLE:

21. JAVA IDENTIFIERS

22. IDENTIFIERS
A Java identifier is a name given to a
package, class, interface, method, or
variable. It allows a programmer to refer
to the item from other places in the
program.

23. Packages: in java it is a mechanism to
encapsulate a group of classes, sub
packages and interfaces
Classes: is a user-defined blueprint or prototype
from which objects are created. It represents the set
of properties or methods that are common to all
objects of one type. In general, class declarations can
include these components

24.  Interfaces: An interface is a completely "abstract
class" that is used to group related methods with
empty bodies:
 Methods: is a block of code which only runs when it is
called. You can pass data, known as parameters, into
a method. Methods are used to perform certain
actions, and they are also known as functions. Why
use methods? To reuse code: define the code once,
and use it many times.

25. PACKAGE

26.  Package in java is a mechanism to encapsulate a
group of classes, sub packages and interfaces

27. TYPES OF PACKAGES

28.  Built-in Packages
These packages consist of a large number of classes which
are a part of Java API.Some of the commonly used built-in
packages are
1) java.lang: Contains language support classes(e.g classed
which defines primitive data types, math operations). This
package is automatically imported.
2) java.io: Contains classed for supporting input / output
operations.
3) java.util: Contains utility classes which implement data
structures like Linked List, Dictionary and support ; for Date /
Time operations.

29. EXAMPLE OF JAVA.LANG

30. JAVA.IO

31. JAVA.UTIL

32.  User-defined packages
These are the packages that are defined by the user.
First we create a directory myPackage (name should
be same as the name of the package). Then create
the MyClass inside the directory with the first
statement being the package names.

33. CLASSES

34.  CLASS: A class is a user-defined blueprint or prototype from
which objects are created. It represents the set of properties or
methods that are common to all objects of one type. In general,
class declarations can include these components, in order:
Modifiers : A class can
be public or has default
access.
Class name: The name
should begin with a initial
letter
Body: The class
body surrounded by
braces, { }.

35. MODIFIERS

36. CLASS NAME

37. BODY

38. IT ANDROID APP