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Increase heap size in Java
...o worry if you've chosen incorrectly, if you ask for 5g on a 32 bit system java will complain about an invalid value and quit.
As others have posted, use the cmd-line flags - e.g.
java -Xmx6g myprogram
You can get a full list (or a nearly full list, anyway) by typing java -X.
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How to send HTTP request in java? [duplicate]
In Java, How to compose a HTTP request message and send it to a HTTP WebServer?
9 Answers
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Why do Objective-C files use the .m extension?
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It stands for "methods". From the comp.lang.objective-C FAQ:
The organisation of Objective-C source is typically similar to that of C or C++ source code, with declarations and object interfaces going into header files named with a .h extension, and definitions...
Number of days between two dates in Joda-Time
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tl;dr
java.time.temporal.ChronoUnit.DAYS.between(
earlier.toLocalDate(),
later.toLocalDate()
)
…or…
java.time.temporal.ChronoUnit.HOURS.between(
earlier.truncatedTo( ChronoUnit.HOURS ) ,
later.truncated...
What are the benefits of Java's types erasure?
...t message with even just the excerpts mentioned thus far:
It's funny when Java users complain about type erasure, which is the only thing Java got right, while ignoring all the things it got wrong.
I get huge benefits (e.g. parametricity) and nil cost (alleged cost is a limit of imagination).
new T...
How to run JUnit test cases from the command line
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For JUnit 5.x it's:
java -jar junit-platform-console-standalone-<version>.jar <Options>
Find a brief summary at https://stackoverflow.com/a/52373592/1431016 and full details at https://junit.org/junit5/docs/current/user-guide/#runn...
Why Maven uses JDK 1.6 but my java -version is 1.7
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add the following to your ~/.mavenrc:
export JAVA_HOME=/Library/Java/JavaVirtualMachines/{jdk-version}/Contents/Home
Second Solution:
echo export "JAVA_HOME=\$(/usr/libexec/java_home)" >> ~/.bash_profile
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Android studio: new project vs new module
...odule.group="LearnCity" external.system.module.version="unspecified" type="JAVA_MODULE" version="4">
<component name="FacetManager">
<facet type="android-gradle" name="Android-Gradle">
<configuration>
<option name="GRADLE_PROJECT_PATH" value=":app" />
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Differences in auto-unboxing between Java 6 vs Java 7
I have noted a difference in auto unboxing behavior between Java SE 6 and Java SE 7. I'm wondering why that is, because I can't find any documentation of changes in this behavior between these two versions.
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Iterating over Java collections in Scala
... Apache POI API. I would like to iterate over the rows contained in the java.util.Iterator that I get from the Sheet class. I would like to use the iterator in a for each style loop, so I have been trying to convert it to a native Scala collection but will no luck.
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