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Java: how to convert HashMap to array
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@Alex "In older Java versions using pre-sized array was recommended (...) However since late updates of OpenJDK 6 this call was intrinsified, making the performance of the empty array version the same and sometimes even better, compared to t...
Should a “static final Logger” be declared in UPPER-CASE?
In Java, static final variables are constants and the convention is that they should be in upper-case. However, I have seen that most people declare loggers in lower-case which comes up as a violation in PMD .
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Differences in boolean operators: & vs && and | vs ||
...); // 6
Thanks to Carlos for pointing out the appropriate section in the Java Language Spec (15.22.1, 15.22.2) regarding the different behaviors of the operator based on its inputs.
Indeed when both inputs are boolean, the operators are considered the Boolean Logical Operators and behave similar...
Graph Algorithm To Find All Connections Between Two Arbitrary Vertices
... a bit weak in that area. I expect that you will be able to translate this Java code without too much trouble though.
Graph.java:
import java.util.HashMap;
import java.util.LinkedHashSet;
import java.util.LinkedList;
import java.util.Map;
import java.util.Set;
public class Graph {
private M...
Creating Unicode character from its number
I want to display a Unicode character in Java. If I do this, it works just fine:
13 Answers
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What is a WeakHashMap and when to use it? [duplicate]
...cted when nothing else references it. (BTW, a strong reference is a normal java reference). There are also weak references which tend not to be as readily collected as soft references (which don't tend to hang about for long after the last strong reference disappears)
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Java recursive Fibonacci sequence
...b(1) + fib(1) + fib(0)
-> 1 + 0 + 1 + 1 + 0
-> 3
I am not sure how Java actually evaluates this, but the result will be the same.
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How to get 0-padded binary representation of an integer in java?
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There is no binary conversion built into the java.util.Formatter, I would advise you to either use String.replace to replace space character with zeros, as in:
String.format("%16s", Integer.toBinaryString(1)).replace(" ", "0")
Or implement your own logic to convert i...
IDEA: javac: source release 1.7 requires target release 1.7
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@Patrick, your pom.xml java compiler plug-in configuration may specify Java version that will override this setting next time you make changes to the pom.xml (if automatic reimport is enabled) or reimport the project manually.
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Lambda Expression and generic method
... tell such a lambda expression with type parameters apart from other legal Java constructs. Thus you have to resort to method references. The target method can declare type parameters using an established syntax.
– Holger
Dec 16 '15 at 10:48
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