Web-android Engineer first-2-2 Understanding Java Identifiers

Source: http://www.imooc.com/code/1177

Q: Is the identifier God horse?

A: Identifiers are symbols that are used to name variables, classes, methods, and so on in a Java program.

There are several rules to follow when using identifiers:

1. Identifiers can consist of letters, numbers, underscores (_), dollar symbols ($) , but cannot contain other special characters, such as @,%, space, etc. , and cannot begin with a number . For example: 123name is not legal drop

2. Identifiers cannot be Java keywords and reserved words (Java reserved keywords, which may be used as keywords in later versions of the upgrade), but can contain keywords and reserved words. For example, void may not be used as an identifier, but myvoid can

3. Identifiers are strictly case-sensitive . So nirvana, be sure to distinguish between Chu Imooc and Imooc is two different identifiers Oh!

4. the name of the identifier should best reflect its role, to be known .

Task

Verify your study results!

Look carefully at the code in the editor, there is an error in line 1 , can you find the error and correct it?

 Public class helloworld%{    publicstaticvoid  main (string[] args) {        System.out.println ("Hello Imooc");}    }

Modified as follows

 Public class HelloWorld {    publicstaticvoid  main (string[] args) {        System.out.println ("Hello Imooc");}    }

Web-android engineer first-2-2 know Java identifiers