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Java array reflection: isArray vs. instanceof
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Right, in Java, primitive data types are not objects, and don't extend java.lang.Object, so that makes sense. But instanceof can still be used to test for primitive arrays.
– erickson
Feb 13 '13 a...
Java generics T vs Object
...ill operate upon, instead of relying on type-casting to enforce this.
See Java Generics* from Oracle.
*Updated Link.
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Looking for simple Java in-memory cache [closed]
I'm looking for a simple Java in-memory cache that has good concurrency (so LinkedHashMap isn't good enough), and which can be serialized to disk periodically.
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Conversion from Long to Double in Java
...g to double conversion because long to double is a narrowing conversion in java.
Conversion from type double to type long requires a nontrivial translation from a 64-bit floating-point value to the 64-bit integer representation. Depending on the actual run-time value, information may be lost.
e.g...
How to use a servlet filter in Java to change an incoming servlet request url?
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Implement javax.servlet.Filter.
In doFilter() method, cast the incoming ServletRequest to HttpServletRequest.
Use HttpServletRequest#getRequestURI() to grab the path.
Use straightforward java.lang.String methods like substring(), split...
Deprecated Java HttpClient - How hard can it be?
...leHttpClient;
import org.apache.http.impl.client.HttpClientBuilder;
import java.io.IOException;
Usage:
HttpClient httpClient = HttpClientBuilder.create().build();
EDIT (after Jules' suggestion):
As the build() method returns a CloseableHttpClient which is-a AutoClosable, you can place the decl...
Why is JavaScript called JavaScript, since it has nothing to do with Java? [closed]
Since JavaScript is not derived from Java, why does it have "Java" in the name?
10 Answers
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Copying files from one directory to another in Java
I want to copy files from one directory to another (subdirectory) using Java. I have a directory, dir, with text files. I iterate over the first 20 files in dir, and want to copy them to another directory in the dir directory, which I have created right before the iteration.
In the code, I want to c...
is there a Java equivalent to null coalescing operator (??) in C#? [duplicate]
Is it possible to do something similar to the following code in Java
6 Answers
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How do I pass a class as a parameter in Java?
Is there any way to pass class as a parameter in Java and fire some methods from that class?
10 Answers
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