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Why is Go so slow (compared to Java)?
...g them entirely (e.g. predicting virtual call destinations in JIT-compiled Java) starts to get tricky.
FWIW, my own very trivial test with Go when I was taking a look at it (a loop of integer addition, basically), gccgo produced code towards the fast end of the range between gcc -O0 and gcc -O2 for...
When and why would you seal a class?
...d be a conscious decision as well. (In C# this is a conscious decision; in Java it isn't.)
EDIT: Some relevant links:
Effective Java, 2nd Edition by Joshua Bloch. See item 17 (requires Safari subscription)
Effective Java Item 17: Design and document for inheritance or else prohibit it (discussion ...
Difference between web reference and service reference?
...posters indicate that it is only ASMX, but Web References can also talk to Java-based Web Services or Python-based or Ruby so long as they all talk WSDL and conform to the WS-I interoperability standard).
A Service Reference will create a client proxy class that communicates with a WCF-based servic...
How do shift operators work in Java? [duplicate]
...
Java defines shift to mask (wrap around) the count down to the 0-31 range, rather than saturate to 32 (if shift by 32 left only zeroes). (using 32bit types for example, obviously.) I assume this decision was made to match t...
User recognition without cookies or local storage
...IP address Can change
Browser Can Change
Browser Cache may be deleted
A Java Applet or Com Object would have been an easy solution using a hash of hardware information, but these days people are so security-aware that it would be difficult to get people to install these kinds of programs on their...
Eclipse: The declared package does not match the expected package
... me, I'll share how I solved this problem.
It turns out that I opened the java file under the 'src' before declaring it a source directory.
After right clicking on the 'src' directory in eclipse, selecting 'build path', and then 'Use as Source Folder'
Close and reopen the already opened java file...
Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:2.3.2:compile (default-compile
...t;JRE System Library -->Environments--> Installed JREs-->Point to java folder in c: drive (Windows) and select JDK folder and ok.
2.Remove the already present JRE from build path.
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Where to use EJB 3.1 and CDI?
I am making a Java EE based product in which I'm using GlassFish 3 and EJB 3.1.
2 Answers
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How would you implement an LRU cache in Java?
...kedHashMap</code> to do that, but that behavior is documented in the JavaDoc for
* <code>LinkedHashMap</code>.
* </p>
*
* @param eldest
* the <code>Entry</code> in question; this implementation doesn't care what it is, since the...
Java Hashmap: How to get key from value?
... you choose to use the Commons Collections library instead of the standard Java Collections API, you can achieve this with ease.
The BidiMap interface in the Collections library is a bi-directional map, allowing you to map a key to a value (like normal maps), and also to map a value to a key, thus ...