Java 7 And Beyond
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| Java 7 And Beyond |
|---|
| Convenor: Ben Evans and Marc Hoffmann |
| Participants:
... |
Summary:
Java 7: New FeaturesBen gives a overview of new featured in Java 7:
Feature CategoriesThese enhancements happen on different levels and can be categories as follows:
Notes and examples on the new featuresBinary Literals and Underscores: Multiline Strings were intended but too hard to get a consensus on how they should work/rules/etc Diamond Operator A Map<Stirng,String> hm = new HashMap<>();
A Map<String, Map<String, String>> hm = new HashMap()<>; // same thing
Also infers a methodCall(new ArrayList<>());
MultiCatch try {
...
} catch (IOException | FileNotFound | SomethingException e) {
// what is e?
// its a disjoint union of types - the compiler works it out. From our perspective its the common super type
}
Try-with-exceptions try (FileOutputStream for = ….; InputStream is = …) {
fos.write();
} finally {
println("All done");
}
Invoke DynamicMarc explained a small example, how Java bytecode with an invokedynamic instruction can be created using the ASM [1] library. As the invokedynamic instruction has been created for new script language, the normal Java compiler will not emit such instructions. The example is available for download [2]. Flip Charts |
| Recommendations:
... |
