Java Cheat Sheet
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This Java cheat sheet summarizes the most commonly-used language features. It is ideal for those new to learning this language.
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Java Cheat Sheet
Java Basic Definitions
Class Particular kind of object
Method Defined inside class
Object Variables and methods
Java Comments
<!-- comment --> Sent to the client
<%-- comment --%> Comment in JSP file
// comment Comment in scriplet JSP
Java Elements
<%! Declaration %>
Creates a global variable or
method
<%= expression %> Evaluated on server before
outputted to page
<%@ directive %>
Attributes that apply to
entire page
<% code fragment %> Contains a block of code
<%@ taglib
uri=”URIToTagLibrary”
prefix=”tagPrefix”%>
Defines a tag library and
prefix
Java Separators
() Surrounds Parameters
{} Defines a block of code
[] Declares arrays
; End of statement
, Separates variables
.
Separates package names
from subpackages/classes
Java Primitive Data Types
Type Description Bits
byte Byte-Length integer 8
short Short Integer 16
int Integer 32
long Long Integer 64
float Single-precision floating point 32
double Double-precision floating point 64
char A single character 16
boolean A boolean value (true or false) 1
Java Operators
+
Addition of numbers, concatenation of
String
+= Add and assign numbers
- 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](https://image.slidesharecdn.com/javacheatsheet-150813172746-lva1-app6891/85/Java-Cheat-Sheet-1-320.jpg)
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Java Cheat Sheet
- 1. Enabling Your Growth Through www.GlowTouch.com Application Development & Support Services Java Cheat Sheet Java Basic Definitions Class Particular kind of object Method Defined inside class Object Variables and methods Java Comments <!-- comment --> Sent to the client <%-- comment --%> Comment in JSP file // comment Comment in scriplet JSP Java Elements <%! Declaration %> Creates a global variable or method <%= expression %> Evaluated on server before outputted to page <%@ directive %> Attributes that apply to entire page <% code fragment %> Contains a block of code <%@ taglib uri=”URIToTagLibrary” prefix=”tagPrefix”%> Defines a tag library and prefix Java Separators () Surrounds Parameters {} Defines a block of code [] Declares arrays ; End of statement , Separates variables . Separates package names from subpackages/classes Java Primitive Data Types Type Description Bits byte Byte-Length integer 8 short Short Integer 16 int Integer 32 long Long Integer 64 float Single-precision floating point 32 double Double-precision floating point 64 char A single character 16 boolean A boolean value (true or false) 1 Java Operators + Addition of numbers, concatenation of String += Add and assign numbers - 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
- 2. Enabling Your Growth Through www.GlowTouch.com Application Development & Support Services Java Cheat Sheet Java Keywords abstract int assert interface boolean long break native byte new case null catch package char private class protected const public continue return default short do static double strictfp else super enum switch extends synchronized false this final throw finally throws float transient for true goto try if void implements violate import while instanceof