java1234 Tutorial Series notes S1 Java SE to eclipse preliminary use, comments, identifiers

Chapter II

In the first section, I talked about simply using eclipse to write a console program. The default package name is not spoken, directly with the package.

Or did you write two console examples?

1  Public class HelloWorld {2      Public Static void Main (String args[]) {3         System.out.println ("Java version Hello world! "); 4     }5 }

Two jobs were left at the same time.

2.1.1 Console Output "I love Java"

2.1.2 Print the following characters

*
***
*****
***
*

The second section is about annotations, naming rules for identifiers, and keywords for java. (There should be nothing to be aware of)

2.2.1 Notes

Single-line//

Multi-Line/* * *

Document/** * * Useful for generating Javadoc standard packages

2.2.2

Identifier: The name of a variable constant function statement block in Java, collectively known as an identifier. A string of alphanumeric underlined dollar signs that begins with the letter underscore $. The first cannot be a number, the identifier cannot be a keyword

java1234 Tutorial Series notes S1 Java SE to eclipse preliminary use, comments, identifiers