BAEL-2994 - String consists of substrings example (#7190)

java-strings-2/src/main/java/com/baeldung/string/repetition/SubstringRepetition.java

@@ -0,0 +1,29 @@
+package com.baeldung.string.repetition;
+
+public class SubstringRepetition {
+
+    public static boolean containsOnlySubstrings(String string) {
+
+        if (string.length() < 2) {
+            return false;
+        }
+
+        StringBuilder substr = new StringBuilder();
+        for (int i = 0; i < string.length() / 2; i++) {
+            substr.append(string.charAt(i));
+
+            String clearedFromSubstrings = string.replaceAll(substr.toString(), "");
+
+            if (clearedFromSubstrings.length() == 0) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    public static boolean containsOnlySubstringsEfficient(String string) {
+
+        return ((string + string).indexOf(string, 1) != string.length());
+    }
+}