Initial knowledge of Java development

Description of the JDK directory:

Bin: Storage of Java related development tools

DB: As the name implies, the lightweight database included with the JRE

Include: an interface file that calls system resources

Operating Environment of Jre:java

LIB: The Core class Library

Src.zip:java's Open source code

JVM: Refers to a Java Virtual machine (role: Explaining the class file and notifying the system what to do, the Java virtual machine is not cross-platform, because different systems have different machine codes)

Jre;java's operating environment, including Java Virtual machines and core class libraries, for users

Jdk:java's development toolset, including JRE and Java development tools, for developers

Path: For the console to be able to find environment variable information under any path

Java_home: Avoid frequent changes to the PATH environment variable information

Classpath: Sets the path information where the class file is located (no configuration required above JDK5.0)

Command:

Javac: Start the Java compiler to compile the specified Java source files

Java: Start the Java Virtual machine to interpret and execute the corresponding class file

Initial knowledge of Java development