Question

I have a problem with a makefile. I have three classes. They do pretty simple stuff. One does an addition on a subtraction, and the last one will instantiate the two and simply print the resulted addition and subtraction.

Now when I create my makefile, I compile my Plus.java and my Minus.java but don’t know how to compile the main class because it depends on the previous two. I want to compile and run it from the makefile if it’s possible.

I get the above results when I try to run make:

javac -g Plus.class Minus.class
javac: invalid flag: Plus.class
Usage: javac <options> <source files>
use -help for a list of possible options
make: *** [Operation.class] Error 2

I don’t know how to proceed; please forgive me if my question is to simple but I am new working with these stuff. I’ve searched many sites but with no answer.

Here is my Makefile:

JCC = javac

JCR = java

JFLAGS = -g

default: Operation.class

Plus.class: Plus.java
    $(JCC) $(JFLAGS) Plus.java

Minus.class: Minus.java
    $(JCC) $(JFLAGS) Minus.java

Operation.class: Operation.class
    $(JCC) $(JFLAGS) Operation.class  

run: Operation.class
    $(JCR) Operation.class

clean:
    $(RM) *.class

Answer 1

I solved it. It was a problem with the packages. I edited my files in netbeans and remained:

package operations

to every one of them

so I got Operation to compile but now it didn’t run

Silly problem….

JCC = javac

JCR = java

JFLAGS = -g

default: Operation.class Plus.class Minus.class

Plus.class: Plus.java
    $(JCC) $(JFLAGS) Plus.java

Minus.class: Minus.java
    $(JCC) $(JFLAGS) Minus.java

Operation.class: Operation.java Plus.java Minus.java
    $(JCC) $(JFLAGS) Operation.java  Plus.java Minus.java

run:
    $(JCR) Operation

clean:
    $(RM) *.class