Java Theory Basic Learning Two

Java Development Tools

Text Editor

UltraEdit

EditPlus

notepad++

Integrated development Environment IDE Integrated development enviroment

JBuilder http://www.borland.com Basic elimination

Eclipse http://www.eclipse.org Focus

NetBeans http://java.sun.com

Java Case-sensitive

The fixed format of the Main method

public static void Main (string[] args)

{

}

A source file can correspond to multiple class files (bytecode files), that is, to write multiple classes in the source file, but only the class with the entry function is decorated with public, the class name and file name must be the same, others do not allow the two

Comments:

1.//This is a single-line comment

2./*

This is a multi-line comment

*/

The Unicode character set is used inside Java, universal

Unicode character set two characters represent one byte

Iso8859-1 Character Set one character represents one byte

Introduction to Character Sets

Basic data types

integers have binary, 8 binary, 16 binary three Ways

int a=10;

Interger.tobinarystring (a); output: 1010

Interger.tooctalstring (a); Output: 12

Interger.tohexstring (a); output: A

Floating point Type

Character type

Boolean

Naming conventions

Constant final eg:final int c=35;

Operator

~ Take counter

& bitwise with same bit 1, different bit 0

| Bitwise OR only 0 is 0, others are 1

^ Bitwise XOR or difference is 1, same as 0

such as: 8, 4 0100, 8&4=0 0000; 8|4=12 1100; ~8=7 0111;8^4= 12 1100

Java Theory Basic Learning Two