Java Reference

Just to update something(hehehe...)

Java Extension Packages
import

Packages
package package_path.package_name

Common Extensions
java.awt, java.io, java.lang, java.util, javax.swing

Data Types
boolean, char, byte, short, int, long, float, double, String

Comments
//Single line Comment
/*Multiple line Comment*/


Arithmetic Operation
+(Addition), -(Subtraction), *(Multiplication), /(Division), %(Modulus)

Equality Operators
== (Equal To), != (Not Equal)

Relational Operators
> (Greater Than), < (Less Than), >= (Greater Than or Equal To), <=(Less Than or Equal To)

In-/Decremental Operators
++x(PreIncrement), x++(PostIncrement), --x(PostIncrement)

Logical Operators
&&(PreIncrement), X++(PostIncrement), --x(PreDecrement), x--(PostDecrement)

Escape Sequence
\n (newline)
\t (horizontal tab)
\r (carraige return)
\\ (backslash)
\" (double quote)

Other
?: (Conditional)
= (Assignment)

If Else
if(){
;
}
else{
;
}

Switch Case
switch(){
case ;
;
break;
case
;
break;
[default:
;]
}

For Loop
for (; ; ){
;
}

While Loop
while()
{;}

Do While Loop
do{

}while();

Arrays
int c[]=new int[5]; //declare and allocate in one
int myArray[]; // declare and allocate in two
myArray = new int[5];
//initialize
myArray ={10,20,30,40,50}
//access 3rd Element
myArray[2]=var;

Method
(parameter)
{



[return ]
}

Class
extends
[implements]
{



}

Exception Handling
try{
;
}catch(Exception e){
//statement on error
}

File IO
BufferedReader in = new BufferedReader(new FileReader(directory.getPath()));
String nextLine = in.readLine(); /
in.close()
//Write to Text
DataOutputStream out = new DataOutputStream(new FielOutputStream(myFile.dat));
out.writeUTF(myText); /
out.close();