solves #2315: Count Asterisks in java

Author: anishLearnsToCode

Diff for: README.md

@@ -744,7 +744,7 @@
 | 2300 | [Successful Pairs of Spells and Potions](https://leetcode.com/problems/successful-pairs-of-spells-and-potions)                                                         |                                                                        [![Python](assets/python.png)](python/successfull_pairs_of_spells_and_potions.py)                                                                         |                                                                                                                                   |
 | 2303 | [Calculate Amount Paid in Taxes](https://leetcode.com/problems/calculate-amount-paid-in-taxes)                                                                         |                                                                                 [![Java](assets/java.png)](src/CalculateAmountPaidInTaxes.java)                                                                                  |                                                                                                                                   |
 | 2309 | [Greatest English Letter in Upper and Lower Case](https://leetcode.com/problems/greatest-english-letter-in-upper-and-lower-case)                                       |                                                                          [![Java](assets/java.png)](src/GreatestEnglishLetterInUpperAndLowerCase.java)                                                                           |                                                                                                                                   |
-| 2315 | [Count Asterisks](https://leetcode.com/problems/count-asterisks)                                                                                                       |                                                                        [![Python](assets/python.png)](python/successfull_pairs_of_spells_and_potions.py)                                                                         |                                                                                                                                   |
+| 2315 | [Count Asterisks](https://leetcode.com/problems/count-asterisks)                                                                                                       |                                                [![Java](assets/java.png)](src/CountAsterisks.java) [![Python](assets/python.png)](python/successfull_pairs_of_spells_and_potions.py)                                                 |                                                                                                                                   |
 | 2316 | [Count Unreachable Pairs of Nodes in an Undirected Graph](https://leetcode.com/problems/count-unreachable-pairs-of-nodes-in-an-undirected-graph)                       |                                                                [![Python](assets/python.png)](python/count_unreachable_pair_of_node_in_an_undirectable_graph.py)                                                                 |                                                                                                                                   |
 | 2319 | [Check if Matrix Is X-Matrix](https://leetcode.com/problems/check-if-matrix-is-x-matrix)                                                                               |                                                                [![Python](assets/python.png)](python/count_unreachable_pair_of_node_in_an_undirectable_graph.py)                                                                 |                                                                                                                                   |
 | 2325 | [Decode the Message](https://leetcode.com/problems/decode-the-message)                                                                                                 |                                                                [![Python](assets/python.png)](python/count_unreachable_pair_of_node_in_an_undirectable_graph.py)                                                                 |                                                                                                                                   |

Diff for: src/CountAsterisks.java

@@ -0,0 +1,26 @@
+// https://leetcode.com/problems/count-asterisks
+// T: O(|s|)
+// S: O(1)
+
+public class CountAsterisks {
+    public int countAsterisks(String s) {
+        boolean seenPipe = false;
+        int count = 0, pipeBuffer = 0;
+
+        for (int index = 0 ; index < s.length() ; index++) {
+            if (s.charAt(index) == '|') {
+                if (seenPipe) {
+                    pipeBuffer = 0;
+                }
+                seenPipe = !seenPipe;
+            }
+
+            if (s.charAt(index) == '*') {
+                if (seenPipe) pipeBuffer++;
+                else count++;
+            }
+        }
+
+        return count + pipeBuffer;
+    }
+}