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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...
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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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...
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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Evaluate empty or null JSTL c tags
...k blank string, I suggest following
<%@ taglib prefix="fn" uri="http://java.sun.com/jsp/jstl/functions"%>
<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core"%>
<c:if test="${empty fn:trim(var1)}">
</c:if>
It also handles nulls
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Java: How to set Precision for double value? [duplicate]
...or double values DecimalFormat is good technique. To use this class import java.text.DecimalFormat and create object of it for example
double no=12.786;
DecimalFormat dec = new DecimalFormat("#0.00");
System.out.println(dec.format(no));
So it will print two digits after decimal point here it wil...