Sample-Java-Makefile.make

#
#
# Sample makefile
#
#

# This macro just describes our java files. This is essentially an array.
# Arrays are specified differently in make, you just list the components separately. Test1 test2 test3 etc.
JAVA_FILES = HelloUser.java HelloUser2.java

# The complete list of sources, this includes the README and Makefile. 
# $(JAVA_FILES) expands to HelloUser.java HelloUser2.java so in total SOURCES equals:
# README Makefile HelloUser.java HelloUser2.java
SOURCES = README Makefile $(JAVA_FILES) #$(MACRO) expands the macro, so $(JAVA_FILES) is replaced by HelloUser.java HelloUser2.java

# List of class files
CLASS_FILES = HelloUser.class HelloUser2.class

# The name of the jarfile to create
JARFILE = Hello

# The main class of the program
MAIN_CLASS = HelloUser2

#
# 
# all builds everything, this is executed by default if you run make without specifying a target.
# The prerequisite is specified as build-jar, so a jar file is built
#
#
all: build-jar

#
# Targets are specified as this:
# target-name: prerequisites
# 
# Targets specified as prereqs are built before the specified target is built
# In this example, build-classes is run before build-jar
#
build-jar: build-classes
	# Java is retarded. 
	# Fucking manifest files?? fuck right off
	# echo prints a message to console and the > character redirects output to a file
	# So if you do echo fuck java > myfile
	# the text "fuck java" will show up in myfile
	# In this bullshit we print Main-Class: $(MAIN_CLASS) to the file Manifest 
	# $(MAIN_CLASS) just expands to HelloUser2
	echo Main-Class: $(MAIN_CLASS) > Manifest
	
	#Literally just run the command. $(JARFILE) expands to Hello and $(CLASS_FILES) expands to HelloUser.class and HelloUser2.class
	jar cvfm $(JARFILE) Manifest $(CLASS_FILES)
	
	#Removes the dumb ass Manifest file
	rm Manifest
	
	#Change permisions and shit
	chmod +x $(JARFILE)
	
#This target runs javac to create the class files
build-classes:
	# echo prints to console
	echo Building class files...
	
	#We run javac, and specify $(JAVA_FILES) which expands to HelloUser.java and HelloUser2.java
	javac -Xlint $(JAVA_FILES)
	echo Done!
	
#This target will remove build products
clean:
	# Remove class files
	rm $(CLASS_FILES)
	
	#Remove jarfile
	rm $(JARFILE)