Java Getting Started learning

I. Steps to develop Java programs
   1). Write the source program (the program ends in. java) the Java source program file uses. java as the extension.
   2). Compile (using Java directives to compile the source program, the compiled file ends with a. Class)
   3). Run (run the compiled file using Java directives)
Two. Java Program structure
  Outer frame public  class  class name {
  } Note: Class name is consistent with file name
   Inner frame
public static void Main (string[] args) {
   } Note: The method name must be a main   comment:     1). The main method is the Java program's entry
   2). A program can have only one main () method
three. output directive
   System.out.println ("");
　　   System.out.print ("");
  NOTE:
    1) The system first letter uppercase
    2) println output after wrapping
       print output only
  
Four common errors
   1) Public-decorated classes must have the same name as the Java file
   2) void in Main () method
   3) Java is case sensitive
   4) in Java, a complete statement is ";" End
   5) The string output must be quoted in quotation marks and must be quoted in English
  \ n and \ t
    \ n line break
 \ T tab (four characters is a tab)

Getting started with Java