BASIC DEFINITIONS
Class Describes a particular kind of object. It can
contain related methods and variables.
Method A function defined in a class. Methods
implement the behavior for objects.
Object The principal building blocks of Java.
Objects consist of variables (data) and
methods (functionality).
COMMENTS
HTML Comments
<!-- comment --> Sent to the client in the viewable
page source.
JSP Commens (Not Sent to Client)
<%-- comment
--%> Comments in JSP file.
// comment Comment in scriplet part of JSP
file.
ELEMENTS
Declaration
<%! declaration %> Creates a global
variable or method.
Expression
<%= expression %> Statements evaluated
on the server before
the page is outputted to
the client.
Page Directive
<%@ directive %> Attributes that apply to
the entire page.
Scriplet
<% code fragment of one or
more lines %> Contains a block of
scripting code which is
executed when the
page is generated.
Taglib Directive
<%@ taglib
uri="URIToTagLibrary"
prefix="tagPrefix" %>
Defines a tag library
and prefix for tags used
in a JSP page.
SEPARATORS
( ) Used to surround parameters
{ } Defines a block of code for a class or method or
to contain the values of automatically initialized
arrays
[ ] Declares arrays or references array values
; Denotes the end of a statement
, Separates variables
. Separates package names from subpackages/
classes or a variable/method from a reference
variable
PRIMITIVE DATA TYPES
Type Description Bits
(Integers)
byte Byte-length integer 8
short Short integer 16
int Integer 32
long Long integer 64
(Real Numbers)
float Single-precision floating point 32
double Double-precision floating point 64
(Other)
char A single character 16
boolean A boolean value (true or false) 1
OPERATORS
+ addition of numbers, concatenation of
Strings
+= add and assign numbers, concatenate
and assign Strings
- subtraction
-= subtract and assign
* multiplication
*= multiply and assign
/ division
/= divide and assign
% take remainder
%= take remainder and assign
++ increment by one
-- decrement by one
> greater than
>= greater than or equal to
< less than
<= less than or equal to
! boolean NOT
!= not equal to
&& boolean AND
|| boolean OR
== boolean equals
= assignment
JAVA SYNTAX CHEAT SHEET
Control
Flow
Selection
If
Else
Switch
Case
Loop
While
Do
For
Exception
Throw
Try
Catch
Finally
Branch
Return
Break
Continue
Label
Key
Words
abstract
assert
boolean
break
byte
case
catch
char
class
const
continue
default
do
double
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
synchronized
this
throw
throws
transient
true
try
void
volatile
while
