1) There are many examples on the Internet and on StackOverflow about the particular issue with generics and varargs. Basically, it’s when you have a variable number of arguments of a type-parameter type: <T> void foo(T… args); In Java, varargs are a syntactic sugar that undergoes a simple “re-writing” at compile-time: a varargs parameter of … Read more
Maven uses the JAVA_HOME parameter to find which Java version it is supposed to run. I see from your comment that you can’t change that in the configuration. You can set the JAVA_HOME parameter just before you start maven (and change it back afterwards if need be). You could also go into your mvn(non-windows)/mvn.bat/mvn.cmd(windows) and … Read more
While my perspective may be biased, my current intention for updating the book would be almost strictly additive, covering fork-join, parallel decomposition, and the new parallel bulk data operations coming in Java SE 8. EDIT 2020: … and Project Loom. EDIT 2021: … and Project Loom 🙂 EDIT 2022: … and Project Loom !
Java 8 provides a nice stream to process all files in a tree. Files.walk(Paths.get(path)) .filter(Files::isRegularFile) .forEach(System.out::println); This provides a natural way to traverse files. Since it’s a stream you can do all nice stream operations on the result such as limit, grouping, mapping, exit early etc. UPDATE: I might point out there is also Files.find … Read more
You can just use the Paths class: Path path = Paths.get(textPath); … assuming you want to use the default file system, of course.
Oracle’s installer puts java inside the /Library/Internet Plug-Ins/JavaAppletPlugin.plugin. And it doesn’t overwrite /usr/bin/java. So, if you issue a whereis java in the terminal, it’ll return /usr/bin/java. (which in turn points to /System/Library/Frameworks/JavaVM.framework/Versions/A/Commands/java, which is Apple’s 1.6 version). So, if you want to use the new java version, replace the /usr/bin/java symlink so that it points … Read more
The issue with List<String> list = new LinkedList(); is that on the left hand side, you are using the generic type List<String> where on the right side you are using the raw type LinkedList. Raw types in Java effectively only exist for compatibility with pre-generics code and should never be used in new code unless … Read more
On your Eclipse IDE, go into Window > Preferences > Java > Installed JREs > and check your installed JREs. You should have an entry with a JDK there. Select the Execution Env as show below. Click OK Then Right-Click on your Project -> Maven -> Update Project Additionally, you may have to change Maven … Read more