6. javac commands and javac commands

6. javac commands and javac commands
Javac [options] [sourcefiles] [@ files] parameters can be arranged in any order. Options command line options. Sourcefiles one or more source files to be compiled (for example, MyClass. java ). @ Files one or more files listing source files. 1. View commands

-G	Generate all debugging information
-G: none	No debugging information is generated
-G: {lines, vars, source}	Only some debugging information is generated.
-Nowarn	No warning is generated
-Verbose	Output the message about the operation being executed by the compiler.
-Deprecation	Output the source location of the obsolete API
-Classpath <path>	Specifies the location for searching user class files
-Cp <path>	Specifies the location for searching user class files
-Sourcepath <path>	Specifies the location of the Input Source file to be searched.
-Bootclasspath <path>	Overwrite the location of the bootstrap File
-Extdirs <directory>	Overwrite the location of the installed extension directory
-Endorseddirs <directory>	Location that overwrites the standard path of the signature
-D <directory>	Specifies the location where the generated class files are stored
-Encoding <encoding>	Specifies the character encoding used by the source file.
-Source <version>	Provides source compatibility with specified versions
-Target <version>	Generate class files for specific VM versions
-Version	Version Information
-Help	Output overview of standard options
-X	Output A summary of non-standard options
J <flag>	Directly pass the <flag> to the runtime system

-D is used to specify the output directory.For example: javac-d. /classes HelloWorld. java means to put HelloWorld. place the compiled java bytecode file in the classes subdirectory of the current directory [note]: ①: if the specified directory does not exist, it will not be created successfully. ②: If HelloWorld. java has a package name named myJava. study. day01, then HelloWorld. the class file will be placed in the current directory/classes/myJava/study. in the day01/folder, if the path is not changed, it is automatically created.