chore: configure PMD to detect main methods

pmd-custom_ruleset.xml

@@ -0,0 +1,28 @@
+<?xml version="1.0"?>
+<ruleset name="TheAlgorithms/Java ruleset"
+    xmlns="http://pmd.sf.net/ruleset/1.0.0"
+    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://pmd.sf.net/ruleset/1.0.0 http://pmd.sf.net/ruleset_xml_schema.xsd"
+    xsi:noNamespaceSchemaLocation="http://pmd.sf.net/ruleset_xml_schema.xsd">
+  <description>
+  Custom PMD checks for TheAlgorithms/Java
+  </description>
+<rule name="UselessMainMethod"
+      language="java"
+      message="The main method is redundant in this context"
+      class="net.sourceforge.pmd.lang.rule.xpath.XPathRule">
+    <description>
+        Avoid using the main method.
+    </description>
+    <priority>3</priority>
+    <properties>
+        <property name="xpath">
+            <value>
+<![CDATA[
+//MethodDeclaration[@Name = "main"]
+]]>
+            </value>
+        </property>
+    </properties>
+</rule>
+</ruleset>

pmd-exclude.properties

@@ -1,64 +1,120 @@
+com.thealgorithms.ciphers.AES=UselessMainMethod
+com.thealgorithms.ciphers.AESEncryption=UselessMainMethod
 com.thealgorithms.ciphers.AffineCipher=UselessParentheses
 com.thealgorithms.ciphers.DES=UselessParentheses
+com.thealgorithms.ciphers.ProductCipher=UselessMainMethod
 com.thealgorithms.ciphers.RSA=UselessParentheses
-com.thealgorithms.conversions.AnyBaseToAnyBase=UselessParentheses
+com.thealgorithms.conversions.AnyBaseToAnyBase=UselessMainMethod,UselessParentheses
 com.thealgorithms.conversions.AnytoAny=UselessParentheses
+com.thealgorithms.conversions.RgbHsvConversion=UselessMainMethod
 com.thealgorithms.datastructures.crdt.Pair=UnusedPrivateField
 com.thealgorithms.datastructures.graphs.AStar=UselessParentheses
 com.thealgorithms.datastructures.graphs.AdjacencyMatrixGraph=CollapsibleIfStatements,UnnecessaryFullyQualifiedName,UselessParentheses
+com.thealgorithms.datastructures.graphs.BellmanFord=UselessMainMethod
 com.thealgorithms.datastructures.graphs.BipartiteGraphDFS=CollapsibleIfStatements
+com.thealgorithms.datastructures.graphs.ConnectedComponent=UselessMainMethod
+com.thealgorithms.datastructures.graphs.Cycles=UselessMainMethod
+com.thealgorithms.datastructures.graphs.Graphs=UselessMainMethod
+com.thealgorithms.datastructures.graphs.KahnsAlgorithm=UselessMainMethod
+com.thealgorithms.datastructures.graphs.MatrixGraphs=UselessMainMethod
 com.thealgorithms.datastructures.hashmap.hashing.HashMapCuckooHashing=UselessParentheses
+com.thealgorithms.datastructures.hashmap.hashing.MainCuckooHashing=UselessMainMethod
 com.thealgorithms.datastructures.heaps.FibonacciHeap=UselessParentheses
 com.thealgorithms.datastructures.heaps.HeapNode=UselessParentheses
 com.thealgorithms.datastructures.lists.DoublyLinkedList=UselessParentheses
+com.thealgorithms.datastructures.lists.Link=UselessMainMethod
+com.thealgorithms.datastructures.lists.RandomNode=UselessMainMethod
 com.thealgorithms.datastructures.lists.SearchSinglyLinkedListRecursion=UselessParentheses
-com.thealgorithms.datastructures.lists.SinglyLinkedList=UnusedLocalVariable
+com.thealgorithms.datastructures.lists.SinglyLinkedList=UnusedLocalVariable,UselessMainMethod
+com.thealgorithms.datastructures.queues.Deque=UselessMainMethod
 com.thealgorithms.datastructures.queues.PriorityQueue=UselessParentheses
+com.thealgorithms.datastructures.trees.BSTRecursiveGeneric=UselessMainMethod
 com.thealgorithms.datastructures.trees.CheckBinaryTreeIsValidBST=UselessParentheses
+com.thealgorithms.datastructures.trees.LCA=UselessMainMethod
+com.thealgorithms.datastructures.trees.NearestRightKey=UselessMainMethod
+com.thealgorithms.datastructures.trees.PrintTopViewofTree=UselessMainMethod
 com.thealgorithms.datastructures.trees.SegmentTree=UselessParentheses
 com.thealgorithms.devutils.nodes.LargeTreeNode=UselessParentheses
 com.thealgorithms.devutils.nodes.SimpleNode=UselessParentheses
 com.thealgorithms.devutils.nodes.SimpleTreeNode=UselessParentheses
 com.thealgorithms.devutils.nodes.TreeNode=UselessParentheses
-com.thealgorithms.divideandconquer.ClosestPair=UnnecessaryFullyQualifiedName,UselessParentheses
+com.thealgorithms.divideandconquer.ClosestPair=UnnecessaryFullyQualifiedName,UselessMainMethod,UselessParentheses
 com.thealgorithms.divideandconquer.Point=UselessParentheses
+com.thealgorithms.dynamicprogramming.CatalanNumber=UselessMainMethod
+com.thealgorithms.dynamicprogramming.EggDropping=UselessMainMethod
+com.thealgorithms.dynamicprogramming.LongestPalindromicSubsequence=UselessMainMethod
 com.thealgorithms.dynamicprogramming.WineProblem=UselessParentheses
 com.thealgorithms.maths.BinomialCoefficient=UselessParentheses
 com.thealgorithms.maths.Complex=UselessParentheses
 com.thealgorithms.maths.DistanceFormulaTest=UnnecessaryFullyQualifiedName
+com.thealgorithms.maths.EulerMethod=UselessMainMethod
+com.thealgorithms.maths.GCDRecursion=UselessMainMethod
 com.thealgorithms.maths.Gaussian=UselessParentheses
 com.thealgorithms.maths.GcdSolutionWrapper=UselessParentheses
 com.thealgorithms.maths.HeronsFormula=UselessParentheses
+com.thealgorithms.maths.JugglerSequence=UselessMainMethod
 com.thealgorithms.maths.KaprekarNumbers=UselessParentheses
-com.thealgorithms.maths.KeithNumber=UselessParentheses
+com.thealgorithms.maths.KeithNumber=UselessMainMethod,UselessParentheses
 com.thealgorithms.maths.LeonardoNumber=UselessParentheses
-com.thealgorithms.maths.LinearDiophantineEquationsSolver=UselessParentheses
+com.thealgorithms.maths.LinearDiophantineEquationsSolver=UselessMainMethod,UselessParentheses
+com.thealgorithms.maths.MagicSquare=UselessMainMethod
+com.thealgorithms.maths.PiNilakantha=UselessMainMethod
+com.thealgorithms.maths.Prime.PrimeCheck=UselessMainMethod
+com.thealgorithms.maths.PythagoreanTriple=UselessMainMethod
 com.thealgorithms.maths.RomanNumeralUtil=UselessParentheses
 com.thealgorithms.maths.SecondMinMax=UselessParentheses
 com.thealgorithms.maths.SecondMinMaxTest=UnnecessaryFullyQualifiedName
+com.thealgorithms.maths.SimpsonIntegration=UselessMainMethod
 com.thealgorithms.maths.StandardDeviation=UselessParentheses
 com.thealgorithms.maths.SumOfArithmeticSeries=UselessParentheses
-com.thealgorithms.maths.TrinomialTriangle=UselessParentheses
+com.thealgorithms.maths.TrinomialTriangle=UselessMainMethod,UselessParentheses
+com.thealgorithms.maths.VectorCrossProduct=UselessMainMethod
 com.thealgorithms.maths.Volume=UselessParentheses
+com.thealgorithms.matrix.RotateMatrixBy90Degrees=UselessMainMethod
 com.thealgorithms.misc.Sparsity=UselessParentheses
-com.thealgorithms.others.CRC16=UselessParentheses
-com.thealgorithms.others.Damm=UnnecessaryFullyQualifiedName
-com.thealgorithms.others.Luhn=UnnecessaryFullyQualifiedName
-com.thealgorithms.others.Mandelbrot=UselessParentheses
-com.thealgorithms.others.MiniMaxAlgorithm=UselessParentheses
-com.thealgorithms.others.PageRank=UselessParentheses
-com.thealgorithms.others.PerlinNoise=UselessParentheses
+com.thealgorithms.others.BankersAlgorithm=UselessMainMethod
+com.thealgorithms.others.BrianKernighanAlgorithm=UselessMainMethod
+com.thealgorithms.others.CRC16=UselessMainMethod,UselessParentheses
+com.thealgorithms.others.CRC32=UselessMainMethod
+com.thealgorithms.others.Damm=UnnecessaryFullyQualifiedName,UselessMainMethod
+com.thealgorithms.others.Dijkstra=UselessMainMethod
+com.thealgorithms.others.GaussLegendre=UselessMainMethod
+com.thealgorithms.others.HappyNumbersSeq=UselessMainMethod
+com.thealgorithms.others.Huffman=UselessMainMethod
+com.thealgorithms.others.InsertDeleteInArray=UselessMainMethod
+com.thealgorithms.others.KochSnowflake=UselessMainMethod
+com.thealgorithms.others.Krishnamurthy=UselessMainMethod
+com.thealgorithms.others.LinearCongruentialGenerator=UselessMainMethod
+com.thealgorithms.others.Luhn=UnnecessaryFullyQualifiedName,UselessMainMethod
+com.thealgorithms.others.Mandelbrot=UselessMainMethod,UselessParentheses
+com.thealgorithms.others.MiniMaxAlgorithm=UselessMainMethod,UselessParentheses
+com.thealgorithms.others.PageRank=UselessMainMethod,UselessParentheses
+com.thealgorithms.others.PerlinNoise=UselessMainMethod,UselessParentheses
 com.thealgorithms.others.QueueUsingTwoStacks=UselessParentheses
-com.thealgorithms.others.Trieac=UselessParentheses
-com.thealgorithms.others.Verhoeff=UnnecessaryFullyQualifiedName
+com.thealgorithms.others.Trieac=UselessMainMethod,UselessParentheses
+com.thealgorithms.others.Verhoeff=UnnecessaryFullyQualifiedName,UselessMainMethod
+com.thealgorithms.puzzlesandgames.Sudoku=UselessMainMethod
+com.thealgorithms.searches.HowManyTimesRotated=UselessMainMethod
 com.thealgorithms.searches.InterpolationSearch=UselessParentheses
 com.thealgorithms.searches.KMPSearch=UselessParentheses
 com.thealgorithms.searches.RabinKarpAlgorithm=UselessParentheses
+com.thealgorithms.searches.RecursiveBinarySearch=UselessMainMethod
+com.thealgorithms.sorts.BogoSort=UselessMainMethod
 com.thealgorithms.sorts.CircleSort=EmptyControlStatement
 com.thealgorithms.sorts.DutchNationalFlagSort=UselessParentheses
 com.thealgorithms.sorts.MergeSortNoExtraSpace=UselessParentheses
 com.thealgorithms.sorts.RadixSort=UselessParentheses
+com.thealgorithms.sorts.TreeSort=UselessMainMethod
 com.thealgorithms.sorts.WiggleSort=UselessParentheses
+com.thealgorithms.stacks.LargestRectangle=UselessMainMethod
+com.thealgorithms.stacks.MaximumMinimumWindow=UselessMainMethod
 com.thealgorithms.stacks.PostfixToInfix=UselessParentheses
+com.thealgorithms.strings.Alphabetical=UselessMainMethod
 com.thealgorithms.strings.HorspoolSearch=UnnecessaryFullyQualifiedName,UselessParentheses
+com.thealgorithms.strings.KMP=UselessMainMethod
+com.thealgorithms.strings.Lower=UselessMainMethod
 com.thealgorithms.strings.Palindrome=UselessParentheses
+com.thealgorithms.strings.Pangram=UselessMainMethod
+com.thealgorithms.strings.RabinKarp=UselessMainMethod
+com.thealgorithms.strings.Rotation=UselessMainMethod
+com.thealgorithms.strings.Upper=UselessMainMethod

pom.xml

@@ -143,6 +143,10 @@
                 <artifactId>maven-pmd-plugin</artifactId>
                 <version>3.26.0</version>
                 <configuration>
+                    <rulesets>
+                        <ruleset>/rulesets/java/maven-pmd-plugin-default.xml</ruleset>
+                        <ruleset>file://${basedir}/pmd-custom_ruleset.xml</ruleset>
+                    </rulesets>
                     <printFailingErrors>true</printFailingErrors>
                     <includeTests>true</includeTests>
                     <linkXRef>false</linkXRef>