What is default javac source mode (assert as identifier compilation)?
- by waste
According to Orcale's Java7 assert guide:
source mode 1.3 (default) — the compiler accepts programs that use assert as an identifier, but issues warnings. In this mode, programs are not permitted to use the assert statement.
source mode 1.4 — the compiler generates an error message if the program uses assert as an identifier. In this mode, programs are permitted to use the assert statement.
I wrote such class:
package mm;
public class ClassTest {
public static void main(String[] arg) {
int assert = 1;
System.out.println(assert);
}
}
It should compile fine if Oracle's info right (1.3 is default source mode). But I got errors like this:
$ javac -version
javac 1.7.0_04
$ javac -d bin src/mm/*
src\mm\ClassTest.java:5: error: as of release 1.4, 'assert' is a keyword, and may not be used as an identifier
int assert = 1;
^
(use -source 1.3 or lower to use 'assert' as an identifier)
src\mm\ClassTest.java:6: error: as of release 1.4, 'assert' is a keyword, and may not be used as an identifier
System.out.println(assert);
^
(use -source 1.3 or lower to use 'assert' as an identifier)
2 errors
I added manually -source 1.3 and it issued warnings but compiled fine. It seems that Oracle's information is wrong and 1.3 is not default source mode. Which one is it then?
