Java Short Explanation

Important Web Address for Java

                               Sun's main Java Web site                                                                Java documentation

                              www.java.sun.com                                                                        java.sun.com/javase/reference

                                Jakarta tomcat site

                                tomcat.apache.org

                                TextPad

                               www.textpad.com

Primitive Data types

Type	Wrapper Class	Parse Method
int	Integer	Integer.parseInt(String s)
double	Double	Double.parseDouble(String s)
short	Short	Short.parseShort(String s)
long	Long	Long.parseLong(String s)
byte	Byte	Byte.parseByte(String s)
float	Float	Float.parseFloat(String s)
char	Character	none
boolean	Boolean	Boolean.parseBoolean(String s)

Operators

Arithmetic
+	Addition
-	Subtraction
*	Multiplication
/	Division
%	Modulus / Remainder
++	Increment
--	Decrement
-=	Subtraction and Assignment
+=	Addition and Assignment
/=	Division and Assignment
%=	Remainder and Assignment
*=	Multiplication and Assignment

Relational
==	Equal
!=	Not equal
>	Greater than
<	Less than
>=	Greater than or equal to
<=	Less than or equal to

Logical
!	Not
&	And
\|	or
&&	Condition And
\|\|	Condition Or

Math Class

num max(num x, num y)	The maximum of x and y
num min(num x, num y)	The minimum of x and y
num abs(num x)	The absolute value of x
int num = math.random()	Random number from 1 to 10

The NumberFormat class

NumberFormat getNumberInstance()	Gets the instance of which format numbers
NumberFormat getCurrencyInstance()	Gets the instance which formats currency
String format(x)	Formats a specified number

Java Statements

Statements	Examples
The break statement	break;
The continue statement	continue;
The for statement	for( initial; condition; counter) { statements; }
The enhanced for statement	for( type variable : array or collection of objects) { statements; }
The while statement	while( condition ) { statements; }
The do-while statement	do { statements; }while( condition );
The if statement	if( condition ) { statements; } else { statements; }
The else-if statement	if ( condition ) { statements; } else if( condition ) { statements; } else { statements; }
The switch statement	switch ( condition ) { case constant: statements; break; default: statements; break; }
The try statement	try { statements; } catch( exception classes) { statements; }