Add digit separation for large integers (#5543)

src/main/java/com/thealgorithms/greedyalgorithms/DigitSeparation.java

@@ -0,0 +1,40 @@
+package com.thealgorithms.greedyalgorithms;
+
+import java.util.ArrayList;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * This class provides methods to separate the digits of a large positive number into a list.
+ */
+public class DigitSeparation {
+    public DigitSeparation() {
+    }
+    /**
+     * Separates the digits of a large positive number into a list in reverse order.
+     * @param largeNumber The large number to separate digits from.
+     * @return A list of digits in reverse order.
+     */
+    public List<Long> digitSeparationReverseOrder(long largeNumber) {
+        List<Long> result = new ArrayList<>();
+        if (largeNumber != 0) {
+            while (largeNumber != 0) {
+                result.add(Math.abs(largeNumber % 10));
+                largeNumber = largeNumber / 10;
+            }
+        } else {
+            result.add(0L);
+        }
+        return result;
+    }
+    /**
+     * Separates the digits of a large positive number into a list in forward order.
+     * @param largeNumber The large number to separate digits from.
+     * @return A list of digits in forward order.
+     */
+    public List<Long> digitSeparationForwardOrder(long largeNumber) {
+        List<Long> result = this.digitSeparationReverseOrder(largeNumber);
+        Collections.reverse(result);
+        return result;
+    }
+}