Number Occurrence.

Author: arpitbhatt027

src/arrays/FindNumberOccurrence.java

@@ -0,0 +1,25 @@
+package arrays;
+
+import java.util.HashMap;
+import java.util.Map;
+import java.util.stream.Stream;
+
+public class FindNumberOccurrence {
+    public static void main(String[] args) {
+        int[] numbers = new int[]{1, 2, 3, 4, 5, 7, 8, 1, 2, 3, 4, 2, 2, 1, 2};
+
+        Map<Integer, Long> numbersMap = new HashMap<>();
+
+        for (Integer number : numbers) {
+            if (numbersMap.containsKey(number)) {
+                Long occurrence = numbersMap.get(number);
+                numbersMap.put(number, occurrence + 1);
+            } else {
+                numbersMap.put(number, 1L);
+            }
+        }
+        for (Map.Entry<Integer, Long> entry : numbersMap.entrySet()) {
+            System.out.println(entry.getKey() + " - " + entry.getValue());
+        }
+    }
+}