To use this makefile to compile your java programs:
- create a file named 'makefile' in your project directory with the
same content as this example starting from "makefile begins".
- modify the CLASSES macro so that it has the names
of your .java files;
- run 'make', and if all goes well, it should compile all of your
java source files that need to be re-built.
# makkefile begins
# define a variable for compiler flags (JFLAGS)
# define a variable for the compiler (JC)
# define a variable for the Java Virtual Machine (JVM)
# define a variable for a parameter. When you run make, you could use:
# make run FILE="Algo.csv" para sobre escribir el valor de FILE.
JFLAGS = -g
JC = javac
JVM= java
FILE=
#
# Clear any default targets for building .class files from .java files; we
# will provide our own target entry to do this in this makefile.
# make has a set of default targets for different suffixes (like .c.o)
# Currently, clearing the default for .java.class is not necessary since
# make does not have a definition for this target, but later versions of
# make may, so it doesn't hurt to make sure that we clear any default
# definitions for these
#
.SUFFIXES: .java .class
#
# Here is our target entry for creating .class files from .java files
# This is a target entry that uses the suffix rule syntax:
# DSTS:
# rule
# DSTS (Dependency Suffix Target Suffix)
# 'TS' is the suffix of the target file, 'DS' is the suffix of the dependency
# file, and 'rule' is the rule for building a target
# '$*' is a built-in macro that gets the basename of the current target
# Remember that there must be a < tab > before the command line ('rule')
#
.java.class:
$(JC) $(JFLAGS) $*.java
#
# CLASSES is a macro consisting of N words (one for each java source file)
# When a single line is too long, use \<return> to split lines that then will be
# considered as a single line. For example:
# NAME = Camilo \
Juan
# is understood as
# NAME = Camilo Juan
CLASSES = \
Experiment.java \
Block.java \
Spring.java \
PhysicsElement.java \
Simulator.java
#
# MAIN is a variable with the name of the file containing the main method
#
MAIN = Experiment
#
# the default make target entry
# for this example it is the target classes
default: classes
# Next line is a target dependency line
# This target entry uses Suffix Replacement within a macro:
# $(macroname:string1=string2)
# In the words in the macro named 'macroname' replace 'string1' with 'string2'
# Below we are replacing the suffix .java of all words in the macro CLASSES
# with the .class suffix
#
classes: $(CLASSES:.java=.class)
# Next two lines contain a target for running the program
# Remember the tab in the second line.
# $(JMV) y $(MAIN) are replaced by their values
run: $(MAIN).class
$(JVM) $(MAIN) $(FILE)
# this line is to remove all unneeded files from
# the directory when we are finished executing(saves space)
# and "cleans up" the directory of unneeded .class files
# RM is a predefined macro in make (RM = rm -f)
#
clean:
$(RM) *.class