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Why does calling a method in my derived class call the base class method?
...ype polymorphism in C# uses explicit virtuality, similar to C++ but unlike Java. This means that you explicitly have to mark methods as overridable (i.e. virtual). In C# you also have to explicitly mark overriding methods as overriding (i.e. override) to prevent typos.
public class Person
{
pub...
How to send an object from one Android Activity to another using Intents?
... was designed for this. It requires a little more effort to use than using Java's native serialization, but it's way faster (and I mean way, WAY faster).
From the docs, a simple example for how to implement is:
// simple class that just has one member property as an example
public class MyParcelab...
PostgreSQL: Which Datatype should be used for Currency?
...ng from a database perspective alone. However, if you combine Postgresql + Java, it is NOT at all good (from my experience). Reading your comment, I used MONEY for most of my currency fields and now I get this Java exception : "SQLException occurred : org.postgresql.util.PSQLException: Bad value for...
Convert light frequency to RGB?
...
For lazy guys (like me), here is an implementation in java of the code found in @user151323 's answer (that is, just a simple translation from pascal code found in Spectra Lab Report):
static private final double Gamma = 0.80;
static private final double IntensityMax = 255;
/**...
@Override is not allowed when implementing interface method
... Level as required
NOTE:
If you get below error after this change,
Error:java: Compilation failed: internal java compiler error
You have to change the target bytecode version as well.
Go to Settings [ Ctrl+Alt+S
]
Select Java Compiler
Select module in the table
Change the byte-code version to ma...
How to store date/time and timestamps in UTC time zone with JPA and Hibernate
...
To the best of my knowledge, you need to put your entire Java app in UTC timezone (so that Hibernate will store dates in UTC), and you'll need to convert to whatever timezone desired when you display stuff (at least we do it this way).
At startup, we do:
TimeZone.setDefault(TimeZ...
Best way to merge two maps and sum the values of same key?
...ption for five years when I finally found Scala. The difference between a Java object reference that might be null and one that cannot be (i.e. between A and Option[A]) is so huge, I couldn't believe they were really the same type. I just started looking at Scalaz. I'm not sure I'm smart enough.....
What is the 'cls' variable used for in Python classes?
... class...it is the same concept as static member and non-static members in java if you are from java background.
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Using the “animated circle” in an ImageView while loading stuff
...centerVertical="true" />
</RelativeLayout>
And in MainActivity.java:
package com.fcchyd.linkletandroid;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import java.u...
Is 1.0 a valid output from std::generate_canonical?
...iKaronen: For sufficiently small angles, sin(x) is simply x. My squawk at Java's sine function relates to is with angles that are near multiples of pi. I would posit that 99% of the time, when code asks for sin(x), what it really wants is the sine of (π/Math.PI) times x. The people maintaining Jav...