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How to get the first element of the List or Set? [duplicate]
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See the javadoc
of List
list.get(0);
or Set
set.iterator().next();
and check the size before using the above methods by invoking isEmpty()
!list_or_set.isEmpty()
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How to test code dependent on environment variables using JUnit?
I have a piece of Java code which uses an environment variable and the behaviour of the code depends on the value of this variable. I would like to test this code with different values of the environment variable. How can I do this in JUnit?
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Java: int array initializes with nonzero elements
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Determining if an Object is of primitive type
...lt into the standard libraries for this, but it's easy to code up:
import java.util.*;
public class Test
{
public static void main(String[] args)
{
System.out.println(isWrapperType(String.class));
System.out.println(isWrapperType(Integer.class));
}
private ...
Collections.emptyMap() vs new HashMap()
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From Effective Java, Item #43 - "Return empty arrays or collections, not null" demonstrates returning an empty collection and perhaps even demonstrates using these emptyList(), emptySet(), and emptyMap() methods on the Collections class to...
Swing vs JavaFx for desktop applications [closed]
...ents.
Now SWT being somewhat old I would like to switch to either Swing or JavaFX. And I would like to hear your thoughts on three things.
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In Clojure how can I convert a String to a number?
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this gives me Exception in thread "main" java.lang.ClassNotFoundException: Integer.,
– maazza
Mar 31 at 8:15
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What's a good IDE for Python on Mac OS X? [closed]
...toring, and whose primary development language is Python. I come from the Java world, and have been a confident user of Eclipse for a good, long time. When not working in Java, I use emacs.
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What is this: [Ljava.lang.Object;?
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[Ljava.lang.Object; is the name for Object[].class, the java.lang.Class representing the class of array of Object.
The naming scheme is documented in Class.getName():
If this class object represents a reference type that i...
How can I get the SQL of a PreparedStatement?
I have a general Java method with the following method signature:
13 Answers
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