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Getting an element from a Set
...of not touching attributes that are part of hashCode/equals. From the Set Javadoc: "Note: Great care must be exercised if mutable objects are used as set elements. The behavior of a set is not specified if the value of an object is changed in a manner that affects equals comparisons while the objec...
Correct way to add external jars (lib/*.jar) to an IntelliJ IDEA project
When creating a new Java project in IntelliJ IDEA, the following directories and files are created:
9 Answers
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Android Bitmap to Base64 String
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I have fast solution. Just create a file ImageUtil.java
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.Base64;
import java.io.ByteArrayOutputStream;
public class ImageUtil
{
public static Bitmap convert(String base64Str) throw...
How to convert .pfx file to keystore with private key?
...wing two commands convert the pfx file to a format that can be opened as a Java PKCS12 key store:
openssl pkcs12 -in mypfxfile.pfx -out mypemfile.pem
openssl pkcs12 -export -in mypemfile.pem -out mykeystore.p12 -name "MyCert"
NOTE that the name provided in the second command is the alias of your...
How many classes should I put in one file? [closed]
I'm used to the Java model where you can have one public class per file. Python doesn't have this restriction, and I'm wondering what's the best practice for organizing classes.
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How to do a JUnit assert on a message in a logger
I have some code-under-test that calls on a Java logger to report its status.
In the JUnit test code, I would like to verify that the correct log entry was made in this logger. Something along the following lines:
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Why should casting be avoided? [closed]
...ast "down" the hierarchy isn't necessarily safe so it's done dynamically.
Java and C# are much more similar to each other. In particular, with both of them casting is (virtually?) always a run-time operation. In terms of the C++ cast operators, it's usually closest to a dynamic_cast in terms of wha...
.toArray(new MyClass[0]) or .toArray(new MyClass[myList.size()])?
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As of ArrayList in Java 5, the array will be filled already if it has the right size (or is bigger). Consequently
MyClass[] arr = myList.toArray(new MyClass[myList.size()]);
will create one array object, fill it and return it to "arr". On th...
Why can't overriding methods throw exceptions broader than the overridden method?
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In my opinion, it is a fail in the Java syntax design. Polymorphism shouldn't limit the usage of exception handling. In fact, other computer languages don't do it (C#).
Moreover, a method is overriden in a more specialiced subclass so that it is more complex ...
Ways to implement data versioning in MongoDB
...s actually used. Is it something that lives withing Mongo somehow? It is a Java library? Is it merely a way of thinking about the problem? No idea and no hints are given.
– ftrotter
Feb 6 '13 at 6:41
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