macOS java assertion compiling error

[ScKaSx]

I am trying to compile an example for java from THE REALLY BIG INDEX:
http://java.sun.com/docs/books/tutorial/java/javaOO/examples/Card.java

However whenever I try to compile:
javac Card.java
I get the following error:
"warning: as of release 1.4, assert is a keyword, and may not be used as an identifier"

And if I try to compile it with enable assertions I get:
javac: invalid flag: -ea
Usage: javac <options> <source files>

Any ideas on how to get this code to compile? I am running Java version 1.4.2_12, which I believe should be able to handle assertions. Thanks for your help.

Cheers,
ScKaSx

 

[therevolution]

Warning messages aren't fatal. If that's all you saw, then the compile was probably successful. Do you see a Card.class in that directory? If so, then you don't need to do anything about the warning.

Also, while I didn't actually try this (nor have I ever used assertions in Java), it looks like you add the '-ea' flag when running your program, not when compiling it. Like this:

java -ea Card

More info on assert here.

 

[aLoC]

From memory, I think it's something like
javac -source 1.4

Then it will understand the asserts as being asserts and not a variable named assert.

 

[ScKaSx]

Thanks -source 1.4 works!

Hey Guys,

Thanks for the response. What worked for me was aloc's suggestion to compile with the flag -source 1.4. Thanks again.

Cheers,
ScKaSx