A few tips before java programming, and a few tips for java programming

A few tips before java programming, and a few tips for java programming

1. First, let's look at the meanings of the abbreviations.

JavaSE Standard Edition Java EE Enterprise Edition javaME Micro Edition

Sdk: soft developement kit, a development kit, including jdk: java developement kit jre: java runtime environment jvm: java Virtual Machine

2. Install jdk with jre. Install jre to run jvm.

3. When configuring environment variables, the following two items are required:

JAVA_HOME: pointing to jdk installation directory Path: pointing to bin directory, convenient to use the tool in bin

4. public class name: the class name and file name must be exactly the same.

5. public static void main (String [] args) {}: four elements of the main method are required

6. Note: generally 30% of the total code

1) single line comment "// balablablabala"

2) multi-line comment "/* balabalabla */"

3) document annotation: generate the api document (export javadoc), which is generally used for annotation classes and annotation methods.

"/**
* Balalala
* Balalala
*/"

7. java is a case-sensitive language.

Int Student; and int student; are two different variables.