Implemented the code to count words in a string in Java

java-strings-3/src/main/java/com/baeldung/string/wordcount/WordCounter.java

@@ -0,0 +1,58 @@
+package com.baeldung.string.wordcount;
+
+import java.util.StringTokenizer;
+
+/**
+ * Created by alfred on 14 August 2019
+ */
+public class WordCounter {
+    public static void main(String[] args) {
+        //test string
+        String random = "Lorem%Ipsum is-simply dummy text.";
+
+        System.out.printf("Using delimiter, word count: %d\n", countWordsUsingTokenizer(random));
+        System.out.printf("Using no library method, word count: %d\n", countWordsManually(random));
+        System.out.printf("Using punctuation regex, word count: %d\n", countWordsUsingRegex(random));
+        System.out.printf("\n\n%s\n\n", random);
+
+    }
+
+    public static int countWordsUsingRegex(String arg) {
+        if (arg == null) {
+            return 0;
+        }
+        final String[] words = arg.split("\\pP|\\s+");
+        return words.length;
+    }
+
+    public static int countWordsUsingTokenizer(String arg) {
+        if (arg == null) {
+            return 0;
+        }
+        final StringTokenizer stringTokenizer = new StringTokenizer(arg);
+        return stringTokenizer.countTokens();
+    }
+
+    public static int countWordsManually(String arg) {
+        if (arg == null) {
+            return 0;
+        }
+
+        int count = 0;
+
+        boolean isAWord = false;
+        int argEnd = arg.length() - 1;
+
+        for (int i = 0; i < arg.length(); i++) {
+            if (Character.isLetter(arg.charAt(i)) && i != argEnd) {
+                isAWord = true;
+            } else if (!Character.isLetter(arg.charAt(i)) && isAWord) {
+                count++;
+                isAWord = false;
+            } else if (Character.isLetter(arg.charAt(i)) && i == argEnd) {
+                count++;
+            }
+        }
+        return count;
+    }
+}