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Java “params” in method signature?
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In Java it's called varargs, and the syntax looks like a regular parameter, but with an ellipsis ("...") after the type:
public void foo(Object... bar) {
for (Object baz : bar) {
System.out.println(baz.toString());
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Access “this” from Java anonymous class
... 'https%3a%2f%2fstackoverflow.com%2fquestions%2f1084112%2faccess-this-from-java-anonymous-class%23new-answer', 'question_page');
}
);
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Name
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Covariance, Invariance and Contravariance explained in plain English?
... I read some articles about Covariance, Contravariance (and Invariance) in Java. I read the English and German Wikipedia article, and some other blog posts and articles from IBM.
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When using the Java debugger in Intellij what does “Drop Frame” mean?
I was using the Java debugger within Intellij 8 and noticed a button labeled "drop frame", does anybody know what purpose this serves? How/why would this be used/useful?
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What is a classpath and how do I set it?
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When programming in Java, you make other classes available to the class you are writing by putting something like this at the top of your source file:
import org.javaguy.coolframework.MyClass;
Or sometimes you 'bulk import' stuff by saying:
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Why does int num = Integer.getInteger(“123”) throw NullPointerException?
...to (int) 123, you can use e.g. int Integer.parseInt(String).
References
Java Language Guide/Autoboxing
Integer API references
static int parseInt(String)
static Integer getInteger(String)
On Integer.getInteger
Here's what the documentation have to say about what this method does:
pub...
Shallow copy of a Map in Java
...uple of ways (maybe others as well) to create a shallow copy of a Map in Java:
3 Answers
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How to give Jenkins more heap space when it´s started as a service under Windows?
...estion is : if the builds is running out of memory , why we should set the java options in the master ?
– yarin
Jan 24 '18 at 8:26
2
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JUnit 4 Test Suites
...rent ways:
right-click and run in Eclipse as Junit test
create a runable Java Application; Main class='org.junit.runner.JUnitCore' and Args='my.package.tests.AllTests'
run from the command line:
$ java -cp build/classes/:/usr/share/java/junit4.jar:/usr/share/java/hamcrest-core.jar org.junit.runne...
Naming convention for utility classes in Java
When writing utility classes in Java, what are some good guidelines to follow?
5 Answers
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