Java Learning Note (ii) basic syntax (i)

Java as a programming language, as in other languages, there are character sets, identifiers and keywords, variables, constants, statements and other basic elements of programming languages.

Keywords: abstract, Boolean Boolean, Break out of loop, continue abort this loop, byte byte, Case,catch,char,class,const,default,do,double,else , Extends,assert,final,finally,float, For,if,implements,import,instandceof,int,interface,long,native,new, Strictfp,package bag, Private,protected,public,return,short,static,super,switch,this,synchronized,throw,throws, Transient,try,void,volatile,while, note: Main is a special name used to describe the starting method of a Java program, but it is not a keyword.

Identifier: rule:

cannot be a keyword or true,false,null;

Can contain letters, numbers 0~9, underscores, dollar sign $;

Cannot begin with a number;

is case-sensitive and does not specify the maximum length;

In addition, the name should be made known;

Hump Naming method: Applicable to the name of the class, the first letter of each word capitalized;

Pascal nomenclature: Applies to variables, the method is named, and the second one is capitalized in the first letter.

Data type: base type, integer Byte,short,int,long floating-point float,double char bool Boolean (value True, False is False ()

Java Learning Note (ii) basic syntax (i)