The resource gets closed before catch or finally blocks. See this tutorial. A try-with-resources statement can have catch and finally blocks just like an ordinary try statement. In a try-with-resources statement, any catch or finally block is run after the resources declared have been closed. To evaluate this is a sample code: class ClosableDummy implements … Read more
Use ImageIO, it can read/write JPEG, PNG, GIF, and BMP out of the box. ImageIO.write(ChartImage, “jpeg”, out); Usually the static write(…) and read(…) methods are enough, if you need to control compression or handle image meta data, check out the Java Image I/O API Guide.
Yes, var and the diamond operator can be combined together. The compiler will infer the most specific generic type: var list = new ArrayList<>(); // Infers ArrayList<Object> var list = new ArrayList<>(List.of(1, 2, 3)); // Infers ArrayList<Integer> And you can even combine them with an anonymous class: var list = new ArrayList<>() {};
Double click on the server to bring up the Overview. Click on Runtime Environment. Select the JRE from the dropdown list. You may need to set this up by clicking on Installed JREs and clicking Add.
This was discussed on the “Project Coin” mailing list. In substance (emphasis mine): Internally, a Java compiler operates over a richer set of types than those that can be written down explicitly in a Java program. The compiler-internal types which cannot be written in a Java program are called non-denotable types. Non-denotable types can occur … Read more
This error message in client layer code is a consequence of code hardening following “SSL V3.0 Poodle Vulnerability – CVE-2014-3566” in recent Java updates. And it is a bug – here are work-arounds in case you cannot update your JRE immediately: A first option is to force TLS protocol when establishing HTTPS connection: If you … Read more
There is now Retrolambda for converting Java 8 bytecode, which uses lambda expressions and method references, to work on Java 7, 6 or 5. (Java 1.4 gave verify errors; did not investigate further.)
This appears to be a javac6 bug, which is fixed in javac7. The workaround is by up-cast: ((Area<?>)area).parent = this; Which seems really odd – why would we need an up-cast to access a member in super class? The root problem is, private members are specifically excluded from inheritance, therefore A does not have a … Read more
Android does not offer all classes that “conventional java” has to offer. Files is one of the classes, that Android doesn’t offer. You can have a look at the classes available in Android here: http://developer.android.com/reference/classes.html So unfortunately you have to use other functions / classes to implement the same functionality. PS: The class is shown … Read more
Check if java JDK is installed correctly dpkg –list | grep -i jdk if not install JDK sudo add-apt-repository ppa:webupd8team/java sudo apt-get update && sudo apt-get install oracle-jdk7-installer After the installation you have enable the jdk update-alternatives –display java Check if Ubuntu uses Java JDK 7 java -version If all went right the answer should … Read more