mirror of
https://github.com/TheAlgorithms/Java.git
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Improve TrieImp.java comments & enhance readability (#5526)
This commit is contained in:
Hardik Pawar
27
DIRECTORY.md
27
DIRECTORY.md
@ -22,7 +22,7 @@
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* [WordSearch](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/backtracking/WordSearch.java)
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* bitmanipulation
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* [BitSwap](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/BitSwap.java)
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* [CountSetBits](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/CountSetBits.java)
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* [CountSetBits](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/CountSetBits.java)
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* [HighestSetBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/HighestSetBit.java)
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* [IndexOfRightMostSetBit](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IndexOfRightMostSetBit.java)
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* [IsEven](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/bitmanipulation/IsEven.java)
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@ -69,7 +69,7 @@
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* [HexaDecimalToBinary](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/HexaDecimalToBinary.java)
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* [HexaDecimalToDecimal](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/HexaDecimalToDecimal.java)
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* [HexToOct](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/HexToOct.java)
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* [IntegerToEnglish] (https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/IntegerToEnglish.java)
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* [IntegerToEnglish](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/IntegerToEnglish.java)
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* [IntegerToRoman](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/IntegerToRoman.java)
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* [OctalToBinary](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/OctalToBinary.java)
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* [OctalToDecimal](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/conversions/OctalToDecimal.java)
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@ -410,7 +410,7 @@
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* [WordBoggle](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/misc/WordBoggle.java)
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* others
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* [ArrayLeftRotation](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/ArrayLeftRotation.java)
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* [ArrayRightRotation](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/ArrayRightRotation.java)
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* [ArrayRightRotation](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/ArrayRightRotation.java)
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* [BankersAlgorithm](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/BankersAlgorithm.java)
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* [BFPRT](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/BFPRT.java)
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* [BoyerMoore](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/BoyerMoore.java)
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@ -559,8 +559,8 @@
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* [CharactersSame](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/CharactersSame.java)
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* [CheckAnagrams](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/CheckAnagrams.java)
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* [CheckVowels](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/CheckVowels.java)
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* [CountChar](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/CountChar.java)
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* [CountWords](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/CountWords.java)
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* [CountChar](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/CountChar.java)
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* [CountWords](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/CountWords.java)
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* [HammingDistance](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/HammingDistance.java)
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* [HorspoolSearch](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/HorspoolSearch.java)
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* [Isomorphic](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/Isomorphic.java)
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@ -575,13 +575,13 @@
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* [Pangram](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/Pangram.java)
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* [PermuteString](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/PermuteString.java)
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* [RabinKarp](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/RabinKarp.java)
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* [ReturnSubsequence](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/ReturnSubsequence.java)
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* [ReturnSubsequence](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/ReturnSubsequence.java)
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* [ReverseString](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/ReverseString.java)
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* [ReverseStringRecursive](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/ReverseStringRecursive.java)
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* [ReverseWordsInString](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/ReverseWordsInString.java)
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* [Rotation](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/Rotation.java)
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* [StringCompression](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/StringCompression.java)
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* [StringMatchFiniteAutomata](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/others/StringMatchFiniteAutomata.java)
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* [StringMatchFiniteAutomata](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/StringMatchFiniteAutomata.java)
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* [Upper](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/Upper.java)
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* [ValidParentheses](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/ValidParentheses.java)
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* [WordLadder](https://github.com/TheAlgorithms/Java/blob/master/src/main/java/com/thealgorithms/strings/WordLadder.java)
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@ -606,7 +606,7 @@
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* [WordSearchTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/backtracking/WordSearchTest.java)
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* bitmanipulation
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* [BitSwapTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/BitSwapTest.java)
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* [CountSetBitsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/CountSetBitsTest.java)
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* [CountSetBitsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/CountSetBitsTest.java)
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* [HighestSetBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/HighestSetBitTest.java)
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* [IndexOfRightMostSetBitTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IndexOfRightMostSetBitTest.java)
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* [IsEvenTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/bitmanipulation/IsEvenTest.java)
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@ -621,6 +621,7 @@
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* [BlowfishTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/BlowfishTest.java)
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* [CaesarTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/CaesarTest.java)
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* [DESTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/DESTest.java)
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* [HillCipherTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/HillCipherTest.java)
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* [PlayfairTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/PlayfairTest.java)
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* [PolybiusTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/PolybiusTest.java)
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* [RSATest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/ciphers/RSATest.java)
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@ -639,6 +640,7 @@
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* [HexaDecimalToBinaryTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/HexaDecimalToBinaryTest.java)
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* [HexaDecimalToDecimalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/HexaDecimalToDecimalTest.java)
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* [HexToOctTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/HexToOctTest.java)
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* [IntegerToEnglishTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/IntegerToEnglishTest.java)
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* [IntegerToRomanTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/IntegerToRomanTest.java)
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* [OctalToBinaryTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/OctalToBinaryTest.java)
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* [OctalToDecimalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/conversions/OctalToDecimalTest.java)
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@ -727,6 +729,7 @@
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* [SameTreesCheckTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/trees/SameTreesCheckTest.java)
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* [SplayTreeTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/trees/SplayTreeTest.java)
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* [TreeTestUtils](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/trees/TreeTestUtils.java)
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* [TrieImpTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/trees/TrieImpTest.java)
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* [VerticalOrderTraversalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/trees/VerticalOrderTraversalTest.java)
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* [ZigzagTraversalTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/datastructures/trees/ZigzagTraversalTest.java)
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* divideandconquer
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@ -991,8 +994,8 @@
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* [CharacterSameTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/CharacterSameTest.java)
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* [CheckAnagramsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/CheckAnagramsTest.java)
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* [CheckVowelsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/CheckVowelsTest.java)
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* [CountCharTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/CountCharTest.java)
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* [CountWordsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/CountWordsTest.java)
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* [CountCharTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/CountCharTest.java)
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* [CountWordsTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/CountWordsTest.java)
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* [HammingDistanceTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/HammingDistanceTest.java)
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* [HorspoolSearchTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/HorspoolSearchTest.java)
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* [IsomorphicTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/IsomorphicTest.java)
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@ -1005,13 +1008,13 @@
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* [PalindromeTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/PalindromeTest.java)
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* [PangramTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/PangramTest.java)
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* [PermuteStringTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/PermuteStringTest.java)
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* [ReturnSubsequenceTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/ReturnSubsequenceTest.java)
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* [ReturnSubsequenceTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/ReturnSubsequenceTest.java)
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* [ReverseStringRecursiveTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/ReverseStringRecursiveTest.java)
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* [ReverseStringTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/ReverseStringTest.java)
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* [ReverseWordsInStringTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/ReverseWordsInStringTest.java)
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* [RotationTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/RotationTest.java)
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* [StringCompressionTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/StringCompressionTest.java)
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* [StringMatchFiniteAutomataTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/others/StringMatchFiniteAutomataTest.java)
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* [StringMatchFiniteAutomataTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/StringMatchFiniteAutomataTest.java)
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* [UpperTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/UpperTest.java)
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* [ValidParenthesesTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/ValidParenthesesTest.java)
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* [WordLadderTest](https://github.com/TheAlgorithms/Java/blob/master/src/test/java/com/thealgorithms/strings/WordLadderTest.java)
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@ -1,19 +1,35 @@
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package com.thealgorithms.datastructures.trees;
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import java.util.Scanner;
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/**
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* Trie Data structure implementation without any libraries
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* Trie Data structure implementation without any libraries.
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* <p>
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* The Trie (also known as a prefix tree) is a special tree-like data structure
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* that is used to store a dynamic set or associative array where the keys are
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* usually strings. It is highly efficient for prefix-based searches.
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* <p>
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* This implementation supports basic Trie operations like insertion, search,
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* and deletion.
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* <p>
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* Each node of the Trie represents a character and has child nodes for each
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* possible character.
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*
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* @author <a href="https://github.com/dheeraj92">Dheeraj Kumar Barnwal</a>
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*/
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public class TrieImp {
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/**
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* Represents a Trie Node that stores a character and pointers to its children.
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* Each node has an array of 26 children (one for each letter from 'a' to 'z').
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*/
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public class TrieNode {
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TrieNode[] child;
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boolean end;
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/**
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* Constructor to initialize a TrieNode with an empty child array
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* and set end to false.
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*/
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public TrieNode() {
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child = new TrieNode[26];
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end = false;
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@ -22,10 +38,22 @@ public class TrieImp {
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private final TrieNode root;
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/**
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* Constructor to initialize the Trie.
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* The root node is created but doesn't represent any character.
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*/
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public TrieImp() {
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root = new TrieNode();
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}
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/**
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* Inserts a word into the Trie.
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* <p>
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* The method traverses the Trie from the root, character by character, and adds
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* nodes if necessary. It marks the last node of the word as an end node.
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*
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* @param word The word to be inserted into the Trie.
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*/
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public void insert(String word) {
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TrieNode currentNode = root;
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for (int i = 0; i < word.length(); i++) {
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@ -39,6 +67,16 @@ public class TrieImp {
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currentNode.end = true;
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}
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/**
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* Searches for a word in the Trie.
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* <p>
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* This method traverses the Trie based on the input word and checks whether
|
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* the word exists. It returns true if the word is found and its end flag is
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* true.
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*
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* @param word The word to search in the Trie.
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* @return true if the word exists in the Trie, false otherwise.
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*/
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public boolean search(String word) {
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TrieNode currentNode = root;
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for (int i = 0; i < word.length(); i++) {
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@ -52,6 +90,17 @@ public class TrieImp {
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return currentNode.end;
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}
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|
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/**
|
||||
* Deletes a word from the Trie.
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* <p>
|
||||
* The method traverses the Trie to find the word and marks its end flag as
|
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* false.
|
||||
* It returns true if the word was successfully deleted, false if the word
|
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* wasn't found.
|
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*
|
||||
* @param word The word to be deleted from the Trie.
|
||||
* @return true if the word was found and deleted, false if it was not found.
|
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*/
|
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public boolean delete(String word) {
|
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TrieNode currentNode = root;
|
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for (int i = 0; i < word.length(); i++) {
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@ -69,75 +118,26 @@ public class TrieImp {
|
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return false;
|
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}
|
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|
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/**
|
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* Helper method to print a string to the console.
|
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*
|
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* @param print The string to be printed.
|
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*/
|
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public static void sop(String print) {
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System.out.println(print);
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}
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/**
|
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* Regex to check if word contains only a-z character
|
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* Validates if a given word contains only lowercase alphabetic characters
|
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* (a-z).
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* <p>
|
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* The method uses a regular expression to check if the word matches the pattern
|
||||
* of only lowercase letters.
|
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*
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* @param word The word to be validated.
|
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* @return true if the word is valid (only a-z), false otherwise.
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*/
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public static boolean isValid(String word) {
|
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return word.matches("^[a-z]+$");
|
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}
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|
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public static void main(String[] args) {
|
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TrieImp obj = new TrieImp();
|
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String word;
|
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@SuppressWarnings("resource") Scanner scan = new Scanner(System.in);
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sop("string should contain only a-z character for all operation");
|
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while (true) {
|
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sop("1. Insert\n2. Search\n3. Delete\n4. Quit");
|
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try {
|
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int t = scan.nextInt();
|
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switch (t) {
|
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case 1:
|
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word = scan.next();
|
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if (isValid(word)) {
|
||||
obj.insert(word);
|
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} else {
|
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sop("Invalid string: allowed only a-z");
|
||||
}
|
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break;
|
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case 2:
|
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word = scan.next();
|
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boolean resS = false;
|
||||
if (isValid(word)) {
|
||||
resS = obj.search(word);
|
||||
} else {
|
||||
sop("Invalid string: allowed only a-z");
|
||||
}
|
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if (resS) {
|
||||
sop("word found");
|
||||
} else {
|
||||
sop("word not found");
|
||||
}
|
||||
break;
|
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case 3:
|
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word = scan.next();
|
||||
boolean resD = false;
|
||||
if (isValid(word)) {
|
||||
resD = obj.delete(word);
|
||||
} else {
|
||||
sop("Invalid string: allowed only a-z");
|
||||
}
|
||||
if (resD) {
|
||||
sop("word got deleted successfully");
|
||||
} else {
|
||||
sop("word not found");
|
||||
}
|
||||
break;
|
||||
case 4:
|
||||
sop("Quit successfully");
|
||||
System.exit(1);
|
||||
break;
|
||||
default:
|
||||
sop("Input int from 1-4");
|
||||
break;
|
||||
}
|
||||
} catch (Exception e) {
|
||||
String badInput = scan.next();
|
||||
sop("This is bad input: " + badInput);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
@ -0,0 +1,76 @@
|
||||
package com.thealgorithms.datastructures.trees;
|
||||
|
||||
import static org.junit.jupiter.api.Assertions.assertFalse;
|
||||
import static org.junit.jupiter.api.Assertions.assertTrue;
|
||||
|
||||
import org.junit.jupiter.api.BeforeEach;
|
||||
import org.junit.jupiter.api.Test;
|
||||
|
||||
public class TrieImpTest {
|
||||
private TrieImp trie;
|
||||
|
||||
@BeforeEach
|
||||
public void setUp() {
|
||||
trie = new TrieImp();
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testInsertAndSearchBasic() {
|
||||
String word = "hello";
|
||||
trie.insert(word);
|
||||
assertTrue(trie.search(word), "Search should return true for an inserted word.");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testSearchNonExistentWord() {
|
||||
String word = "world";
|
||||
assertFalse(trie.search(word), "Search should return false for a non-existent word.");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testInsertAndSearchMultipleWords() {
|
||||
String word1 = "cat";
|
||||
String word2 = "car";
|
||||
trie.insert(word1);
|
||||
trie.insert(word2);
|
||||
|
||||
assertTrue(trie.search(word1), "Search should return true for an inserted word.");
|
||||
assertTrue(trie.search(word2), "Search should return true for another inserted word.");
|
||||
assertFalse(trie.search("dog"), "Search should return false for a word not in the Trie.");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDeleteExistingWord() {
|
||||
String word = "remove";
|
||||
trie.insert(word);
|
||||
assertTrue(trie.delete(word), "Delete should return true for an existing word.");
|
||||
assertFalse(trie.search(word), "Search should return false after deletion.");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testDeleteNonExistentWord() {
|
||||
String word = "nonexistent";
|
||||
assertFalse(trie.delete(word), "Delete should return false for a non-existent word.");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testInsertAndSearchPrefix() {
|
||||
String prefix = "pre";
|
||||
String word = "prefix";
|
||||
trie.insert(prefix);
|
||||
trie.insert(word);
|
||||
|
||||
assertTrue(trie.search(prefix), "Search should return true for an inserted prefix.");
|
||||
assertTrue(trie.search(word), "Search should return true for a word with the prefix.");
|
||||
assertFalse(trie.search("pref"), "Search should return false for a prefix that is not a full word.");
|
||||
}
|
||||
|
||||
@Test
|
||||
public void testIsValidWord() {
|
||||
assertTrue(TrieImp.isValid("validword"), "Word should be valid (only lowercase letters).");
|
||||
assertFalse(TrieImp.isValid("InvalidWord"), "Word should be invalid (contains uppercase letters).");
|
||||
assertFalse(TrieImp.isValid("123abc"), "Word should be invalid (contains numbers).");
|
||||
assertFalse(TrieImp.isValid("hello!"), "Word should be invalid (contains special characters).");
|
||||
assertFalse(TrieImp.isValid(""), "Empty string should be invalid.");
|
||||
}
|
||||
}
|
||||
Reference in New Issue
Block a user