Rules and norms notes 004_JAVA comment keyword identifiers

summary:

1, JAVA program in the comment concept : is to make the program better able to understand, explain and explain to add!

1. Single-line comments: // representation
2. Multi-line comments: / ** * Content / shortcut keys: Ctrl + Shift + /

2, keyword : JAVA which has been pre-defined a special English words,

比如：public、static、class、void

3, the identifier : Some English words define our own mark. For example, the name of our HelloWorld applet

4, naming and naming conventions

1. Hard requirement: as far as possible to begin with letters (26 letters of the alphabet can be), may comprise from 0 to 9, $, _
   1. Identifier can not begin (custom) digitally.
   2. Identifier can not be a keyword.
   3. Extracurricular added:
      variable name only alphanumeric $ _
      variable is the first character only letters $ _
      variable first character can not use digital
2. Soft suggestion: follow the hump logo
   1. The first letter of the first name of the class as much as possible should be capitalized, the next encounter a new word must be capitalized (big camel).
   2. The method name in lowercase, then encounter a new word must be capitalized (small camel).
   3. Variables also to the first letter lowercase, then encounter a new word must be capitalized (small camel).
      Easy to understand:

    public class HelloWorld（类名称）{
       	public static void main（方法名称）(String[] args){
               int i(变量名称)=5;
       		System.out.println("java,你好！");
       	}
       }

5, pay attention

• $ Is java bytecode compiler to create a character internal use, it is recommended not to use in the source program