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java get file size efficiently
While googling, I see that using java.io.File#length() can be slow.
FileChannel has a size() method that is available as well.
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Causes of getting a java.lang.VerifyError
I'm investigating the following java.lang.VerifyError
25 Answers
25
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What's Up with Logging in Java? [closed]
...) - I don't think it is sensible to decide using this point as the reason.
Java logging because you don't want to add in an extra jar.
SLF4j because it's newer than Commons Logging and provides parameterized logging:
logger.debug("The entry is {}.", entry);
//which expands effectively to
if (log...
How can I increment a date by one day in Java?
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I'll quote some JavaDocs... Calendar.DATE: "...This is a synonym for DAY_OF_MONTH." I wish the JavaDocs would clarify that this would increment larger fields (like the month and year). Calendar.roll "Adds or subtracts (up/down) a single ...
Is there a Null OutputStream in Java?
...r an API I'm using, but I don't actually have a need for the output. Does Java have an OutputStream equivalent to > /dev/null ?
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How to determine equality for two JavaScript objects?
...a way to tell if two objects are equal, much like the hash code value in Java?
64 Answers
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Reuse a parameter in String.format?
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docs.oracle.com/javase/8/docs/api/java/util/Formatter.html#dpos
– Vadzim
Dec 22 '17 at 16:08
add a comment
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Symbol for any number of any characters in regex?
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Good answer, would just add see here: download.oracle.com/javase/1.4.2/docs/api/java/util/regex/…
– Steve
Jun 22 '11 at 13:59
12
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Make $JAVA_HOME easily changable in Ubuntu [closed]
In Ubuntu, I'd like to switch my JAVA_HOME environment variable back and forth between Java 5 and 6.
8 Answers
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How to run a JAR file
...onstration, but here's another one from scratch. You need two files:
Test.java:
public class Test
{
public static void main(String[] args)
{
System.out.println("Hello world");
}
}
manifest.mf:
Manifest-version: 1.0
Main-Class: Test
Note that the text file must end with a n...