I’ve been testing it out with a heavy application: 60-70GB allocated to heap, with 20-50GB in use at any time. With these sorts of applications, it’s an understatement to say that your mileage may vary. I’m running JDK 1.6_22 on Linux. The minor versions are important– before about 1.6_20, there were bugs in G1 that … Read more
Finding the most specific method is defined in a very formal way in the Java Language Specificaion (JLS). I have extracted below the main items that apply while trying to remove the formal formulae as much as possible. In summary the main items that apply to your questions are: JLS 15.12.2: your use case falls … Read more
Yes, the type of ex is the most specific supertype of both CharacterCodingException and UnknownServiceException, which would be IOException. Edit: Straight from the horse’s mouth on http://cr.openjdk.java.net/~darcy/ProjectCoin/ProjectCoin-Documentation-v0.83.html#multi_catch: Informally, the lub (least upper bound) is the most specific supertype of the types in question.
This is as designed. Java 7 has changed the way Locale.getDefault() works. A defect has been entered with Oracle, but they basically said this is As Designed. To sum up, you must modify the Display Language of the OS. Modifying the Region Format only is no longer sufficient. Read the bug report here: Locale.getDefault() returns … Read more
see this: From http://www.oracle.com/technetwork/java/javase/compatibility-417013.html#source Area: API: Utilities Synopsis: Updated sort behavior for Arrays and Collections may throw an IllegalArgumentException Description: The sorting algorithm used by java.util.Arrays.sort and (indirectly) by java.util.Collections.sort has been replaced. The new sort implementation may throw an IllegalArgumentException if it detects a Comparable that violates the Comparable contract. The previous implementation silently … Read more
According to JVMS7 : The fact that end_pc is exclusive is a historical mistake in the design of the Java virtual machine: if the Java virtual machine code for a method is exactly 65535 bytes long and ends with an instruction that is 1 byte long, then that instruction cannot be protected by an exception … Read more
Originally Android development tools supported only jdk 6 features. But that was changed, first by Android Studio 0.3.2 in October 2013 see: http://tools.android.com/recent/androidstudio032released Support for language features like the diamond operator, multi-catch, try-with-resources, strings in switches, etc. When creating a new project, you can specify a source language level: Note that you can use all … Read more
Answer Clarification – Android Studio supports JDK8 The following is an answer to the question “What version of Java does Android support?” which is different from “What version of Java can I use to run Android Studio?” which is I believe what was actually being asked. For those looking to answer the 2nd question, you … Read more
It’s correct and there’s no requirement for catch clause. Oracle java 7 doc says the resource will be closed regardless of whether an exception is actually thrown or not. You should use a catch clause only if you want to react upon the exception. The catch clause will be executed after the resource is closed. … Read more
Technical differences are a consequence of the goal of each one (OpenJDK is meant to be the reference implementation, open to the community, while Oracle is meant to be a commercial one) They both have “almost” the same code of the classes in the Java API; but the code for the virtual machine itself is … Read more