Makefile for Java cannot find package

Question

Hello I am new in Java development. I tried to write a makefile which should be runnable in Linux:

JFLAGS = -g

JC = javac

.SUFFIXES: .java .class

.java.class:

 $(JC) $(JFLAGS) $*.java



Heap.class: FibonacciHeap.java \
    FileOperation.java \
    MinLeftistTree.java \
    RandomPermutation.java \
   Heap.java 
default: classes
classes: $(CLASSES:.java=.class)
clean:

 $(RM) *.class

In my assumption, Heap.class should be dependent on all the other java file. Also, the main file should be in it as well.

However, I cannot get it run, it shows

    Heap.java:3: package heap.FibonacciHeap does not exist

and cannot find the other reference from other java file, such as

Heap.java:61: cannot find symbol symbol  : variable RandomPermutation location: class heap.Heap
       list = RandomPermutation.GetList(listnum[route]);

This program runs fine in eclipse. Do you have any suggestions?

I am new and I might commit some mistake....and I don't know much about compiler and make file. If you can point it out I will be grateful!

Answer 1

I don't see where you set CLASSPATH. I don't care that it's a make file or Ant - javac.exe and java.exe expect the CLASSPATH to be set when they run. Where's yours?

I believe you have to set CLASSPATH in the makefile, before you run javac.exe.

I'd forget about make (and Eclipse) for a moment. Can you make this project compile and run in a command shell? If you can't, I'd say that you should not be leaning on any tools to help you.

Reading this might be helpful.

Is make really a requirement for fulfilling this assignment? How will the professor know that you used Eclipse or make or Ant or command shell to compile your .java to .class files?