Oracle Certification Associate 1Z0-808

Installation

Windows

<source lang="Shell"> C:\Program Files\Java </source>

• Java Se Development Kit 8
  • Java FX SDK
  • Private JRE - Java Runtime Edition
  • Java Mission Control Tools

Can also be installed:

• • Development Tools
  • Source Code
  • Public JRE

Linux

<source lang="Shell"> sudo apt-get install oracle-java8-installer cd /usr/lib/jvm/java-8-oracle

1. Java version

java -v

1. Java Compiler

javac -version </source>

Basics

Main Method

<source lang="Java"> public static void main(String[] args]) </source>

Comments

<source lang="Java"> // Single Line Comment

/* Multi Line Comment

• /

/**

* Java Doc Comment
* @param
* @return 
*/

</source>

Import Conflicts

<source lang="Java"> import java.util.*; import java.sql.*;

// ==> in code = COMPILATION error Date date; </source>

Static Imports

It is not a good idea to do static imports a lot in a projet because it makes difficult to understand where the methods / constants come from

• Static imports are for importing static members
• Classic imports are for importing classes

it can be used for methods and constants for example <source lang="Java"> import static java.lang,Math.*;

// Instead of typing Math.min(1,2); we can just type min(1,2) // Because of the static import </source>

Primitives

KeyWord	Size	Examples	Smallest Data-Type
Boolean	-	true
Numbers without decimal points
byte	8-bits	1
short	16-bits	12	comment
int	32-bits	100	Default all numbers in Java
long	64 bits	12
float	32-bits	123.45	Requires letter "f" following the numbers
double	64-bits	123.45	Default all primitives or all that similar types
char	16-bits	'a'