javac

# To compile a simple source file:
javac HelloWorld.java

# To compile several source files:
javac *.java

# To specify another destination directory:
javac -d build HelloWorld.java

# To use another source directory for source dependencies:
javac -sourcepath src/dependencies/java Main.java

# To define where compiled dependencies should be searched:
javac -classpath lib/commons-cli-1.4.jar:lib/log4j-1.2.12.jar HelloWorld.java

# To consider warnings as errors:
javac -Werror NoWarning.java

# To compile Java 7 code:
javac -source 1.7 Java7.java

# To make the compiler more verbose:
javac -verbose *.java

# To display usage of deprecated APIs:
javac -deprecation App.java

# To include debugging info in class files:
javac -g HelloWorld.java

# To display version:
javac -version

# To get help:
javac -help