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What is the difference between “Class.forName()” and “Class.forName().newInstance()”?
... Demo demo = (Demo) clazz.newInstance();
}
}
As explained in its javadoc, calling Class.forName(String) returns the Class object associated with the class or interface with the given string name i.e. it returns test.Demo.class which is affected to the clazz variable of type Class.
Then, c...
Why is there no String.Empty in Java?
...w about this string from back over here". I'm admittedly no expert in the java compiler, but how could this NOT be the case? And I would think skipping that check would result in a minuscule improvement in compile times.
– Tom Tresansky
Aug 10 '10 at 15:52
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Eclipse count lines of code
... Lines of Code metrics by ignoring blank and comment-only lines or exclude Javadoc if you want. To do this check the tab at Preferences -> Metrics -> LoC.
That's it. There is no special option to exclude curly braces {}.
The plugin offers an alternative metric to LoC called Number of Stateme...
Java lib or app to convert CSV to XML file? [closed]
Is there an existing application or library in Java which will allow me to convert a CSV data file to XML file?
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Byte order mark screws up file reading in Java
I'm trying to read CSV files using Java. Some of the files may have a byte order mark in the beginning, but not all. When present, the byte order gets read along with the rest of the first line, thus causing problems with string compares.
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How can I sort a List alphabetically?
...ssuming that those are Strings, use the convenient static method sort…
java.util.Collections.sort(listOfCountryNames)
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Java - get pixel array from image
...d!
Here is a comparison I've setup to compare the two approaches:
import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import java.io.IOException;
import javax.imageio.ImageIO;
public class PerformanceTest {
public static void main(String[] args) throws IOException {
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Find where java class is loaded from
Does anyone know how to programmaticly find out where the java classloader actually loads the class from?
11 Answers
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Why there is no ConcurrentHashSet against ConcurrentHashMap
...u use a method to produce a set from a given map (or map class).
Prior to Java 8, you produce a concurrent hash set backed by a concurrent hash map, by using Collections.newSetFromMap(map)
In Java 8 (pointed out by @Matt), you can get a concurrent hash set view via ConcurrentHashMap.newKeySet(). T...
String.equals versus == [duplicate]
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@mo in some cases even in java == can be misleading. Java caches strings and so something like this would return true. String a = "Hello"; String b = "Hello"; a == b is true even though one would normally expect the result to be false.
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