Java Quick Reference Guide printable pdf download

JAVA Quick Reference

addition, subtraction, multiplication, division

+, -, *, /

abstract

boolean

break

byte

byvalue

modulus, increment, decrement.

%, ++, --

case

cast

catch

char

class

Author: Jialong He

Relational Operators

const

continue

default

double

equal, not equal, greater, less,

==, !=, >, <,

else

extends

false

final

finally

greater or equal, less or equal.

>=, <=

float

for

future

generic

goto

Simple Data Types

Logical Operators

i f

implements

import

inner

instanceof

-128..127

byte

AND, OR, NOT, XOR, short -circuit OR, AND

&, |, !, ^, ||, &&,

int

interface

long

native

new

-32,768..32,767

short

null

operator

outer

package

private

Bitwise Operators

-2,147,483,648.. 2,147,483,647

int

protected public

rest

return

short

-9,223,372,036,854,775,808..

AND, OR, NOT, XOR

long

&, |, ~, ^,

9,223,372,036,854,775,807

shift right, shift right zero fill, shift left.

>>, >>>, <<

static

super

switch

synchronized this

3.4e-0.38.. 3.4e+0.38

Comments

throw

throws

transient

true

try

float

1.7e-308.. 1.7e+308

var

void

volatile

while

double

// rest of line

Complete Unicode Character Set

/* multiline comment */

char

Java packages

/** documentation comment */

true, false

Boolean

Provides the classes necessary to create an applet

java.applet

Compile and Run

decare a variable:

and the classes an applet uses to communicate with

type identifier [= value];

javac nameOfFile.java

its applet context.

java nameOfFile

Contains all of the classes for creating user

java.awt

interfaces and for painting graphics and images.

Arrays

CLASSPATH must set correctly.

The name of the file has to match exactly the name of the class.

Provides classes for color spaces.

java.awt.color

int

array_name[ ];

declare an integer array and allocate

Provides interfaces and classes for transferring data

array_name=new

int[100 ];

100 elements of memory.

Flow Control

java.awt.datatransfe

between and within applications.

int

array_name[ ] =

new int

[

declare and allocate an integer array in

if (Boolean-expression) statement1; [ else statement2; ]

Drag and Drop is a direct manipulation gesture

100];

one statement.

java.awt.dnd

while loop

int

array_name [ ] = {1, 2, 3, 4};

found in many Graphical User Interface systems

[initialization]

that provides a mechanism to transfer information

while (termination-clause) {

between two entities logically associated with

int

array_name[] =

new

multidimensional array.

body;

presentation elements in the GUI.

int[10][20];

[iteration;]

}

Provides interfaces and classes for dealing with

java.awt.event

for reference type (class, array).

null

different types of events fired by AWT

do while loop

components.

do {

body;

Provides classes and interface relating to fonts.

java.awt.font

[iteration;]

Class

Provides the Java 2D classes for defining and

} while (termination-clause);

java.awt.geom

performing operations on objects related to two-

for loop

{public|final|abstract} class name

dimensional geometry.

for (initialization; termination-clause; iteration)

{ [class_variable_declarations]

body;

Provides classes and interfaces for the input method

public static void main{String[] args) {statements}

java.awt.im

framework.

[methods]

Program Structure

}

Provides interfaces that enable the development of

class className {

java.awt.im.spi

input methods that can be used with any Java

public static void main (String args[ ]) {

this, super

runtime environment.

statements;

}

Methods

java.awt.image

Provides classes for creating and modifying

method definition1

images.

{public

private

} [static] {type | void} name(arg, ..., arg ) {statements}

…

Provides classes and interfaces for producing

method definitionN

java.awt.image.rend

Variable

rendering-independent images.

}

erable

Provides classes and interfaces for a general

{public

private

} [static] type name [= expression];

java.awt.print

printing API.

Arithmetic Operators

Key words

Contains classes related to developing beans --

java.beans

components based on the JavaBeans

architecture.

Java Quick Reference Guide

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