Use <> to replace <> <>
At the end, a clear goal is added, and the clear class file is always a good idea because it can avoid errors in the future compilation. Suppose you define a constant foo in class A and use it in class B. When you compile these Java source files, the value of foo is embedded in the class B class file. If you modify the value of the foo and recompile (no delete class file), the Javac task will not be compiled class B because its source file is older than the corresponding class, so the old value will remain unchanged. This issue cannot be solved even with Javac using the depend attribute, because this option of the Java compiler is an error. JIKES's relevance check is better, but you should rebuild all kinds of files, so that it is the fastest way.
