Data commit

Task/Count-occurrences-of-a-substring/Java/count-occurrences-of-a-substring-1.java

@@ -0,0 +1,9 @@
+int countSubstring(String string, String substring) {
+    substring = Pattern.quote(substring);
+    Pattern pattern = Pattern.compile(substring);
+    Matcher matcher = pattern.matcher(string);
+    int count = 0;
+    while (matcher.find())
+        count++;
+    return count;
+}

Task/Count-occurrences-of-a-substring/Java/count-occurrences-of-a-substring-2.java

@@ -0,0 +1,11 @@
+public class CountSubstring {
+	public static int countSubstring(String subStr, String str){
+		return (str.length() - str.replace(subStr, "").length()) / subStr.length();
+	}
+	
+	public static void main(String[] args){
+		System.out.println(countSubstring("th", "the three truths"));
+		System.out.println(countSubstring("abab", "ababababab"));
+		System.out.println(countSubstring("a*b", "abaabba*bbaba*bbab"));
+	}
+}

Task/Count-occurrences-of-a-substring/Java/count-occurrences-of-a-substring-3.java

@@ -0,0 +1,15 @@
+import java.util.regex.Pattern;
+
+public class CountSubstring {
+	public static int countSubstring(String subStr, String str){
+		// the result of split() will contain one more element than the delimiter
+		// the "-1" second argument makes it not discard trailing empty strings
+		return str.split(Pattern.quote(subStr), -1).length - 1;
+	}
+	
+	public static void main(String[] args){
+		System.out.println(countSubstring("th", "the three truths"));
+		System.out.println(countSubstring("abab", "ababababab"));
+		System.out.println(countSubstring("a*b", "abaabba*bbaba*bbab"));
+	}
+}

Task/Count-occurrences-of-a-substring/Java/count-occurrences-of-a-substring-4.java

@@ -0,0 +1,15 @@
+public class CountSubstring {
+	public static int countSubstring(String subStr, String str){
+		int count = 0;
+		for (int loc = str.indexOf(subStr); loc != -1;
+		     loc = str.indexOf(subStr, loc + subStr.length()))
+			count++;
+		return count;
+	}
+	
+	public static void main(String[] args){
+		System.out.println(countSubstring("th", "the three truths"));
+		System.out.println(countSubstring("abab", "ababababab"));
+		System.out.println(countSubstring("a*b", "abaabba*bbaba*bbab"));
+	}
+}