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When should a class be Comparable and/or Comparator?
...comparing itself with another object. The class itself must implements the java.lang.Comparable interface in order to be able to compare its instances.
Comparator
A comparator object is capable of comparing two different objects. The class is not comparing its instances, but some other class’s i...
For a boolean field, what is the naming convention for its getter/setter?
...ublic void setActive(boolean active){this.active = active;}
See Also
Java Programming/Java Beans
Code Conventions for the Java Programming Language
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What is the rationale behind having companion objects in Scala?
...ent possible sets of parameters (compare to what Bloch writes in Effective Java about telescoping constructor)
with the ability to to decide which derived class you want to create instead of the abstract (accompanied) one
Example code:
abstract class AbstractClass;
class RealThing(s: String) exte...
How can I get zoom functionality for images?
...ut the github project to get the latest code.
USAGE
Place TouchImageView.java in your project. It can then be used the same as
ImageView. Example:
TouchImageView img = (TouchImageView) findViewById(R.id.img);
If you are using TouchImageView in xml, then you must provide the full package
name, b...
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...
Difference between timestamps with/without time zone in PostgreSQL
...d '2011-07-01 06:30:30+05' are the same as just '2011-07-01 06:30:30'.
For Java developers: it's analogous to java.time.LocalDateTime.
TIMESTAMP WITH TIME ZONE stores a point on the UTC time line. How it looks (how many hours, minutes, etc.) depends on your time zone, but it always refers to the sam...
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
...
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 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 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...