mirror of
https://github.com/TheAlgorithms/Java.git
synced 2025-07-08 18:32:56 +08:00
@ -16,6 +16,7 @@ public class CountWords {
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String str = input.nextLine();
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String str = input.nextLine();
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System.out.println("Your text has " + wordCount(str) + " word(s)");
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System.out.println("Your text has " + wordCount(str) + " word(s)");
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System.out.println("Your text has " + secondaryWordCount(str) + " word(s)");
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input.close();
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input.close();
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}
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}
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@ -25,4 +26,25 @@ public class CountWords {
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return s.trim().split("[\\s]+").length;
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return s.trim().split("[\\s]+").length;
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}
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}
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/**
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* counts the number of words in a sentence but ignores all potential
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* non-alphanumeric characters that do not represent a word. runs in O(n) where
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* n is the length of s
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*
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* @param s String: sentence with word(s)
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* @return int: number of words
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*/
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private static int secondaryWordCount(String s) {
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if (s == null || s.isEmpty())
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return 0;
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StringBuilder sb = new StringBuilder();
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for (char c : s.toCharArray()) {
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if (Character.isLetter(c) || Character.isDigit(c))
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sb.append(c);
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}
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s = sb.toString();
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return s.trim().split("[\\s]+").length;
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}
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}
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}
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@ -22,4 +22,29 @@ class Palindrome {
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return SecondWay(x.substring(1, x.length() - 1));
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return SecondWay(x.substring(1, x.length() - 1));
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}
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}
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/**
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* This method ignores all non-alphanumeric characters and case runs in O(n)
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* where n is the length of s
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*
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* @param s String to check
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* @return true if s is palindrome else false
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*/
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public boolean isPalindrome(String s) {
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s = s.toLowerCase().trim();
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StringBuilder sb = new StringBuilder();
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for (char c : s.toCharArray()) {
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if (Character.isLetter(c) || Character.isDigit(c))
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sb.append(c);
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}
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s = sb.toString();
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int start = 0;
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int end = s.length() - 1;
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while (start <= end) {
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if (s.charAt(start++) != s.charAt(end--))
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return false;
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}
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return true;
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}
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}
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}
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