Update SinglyLinkedList.java

Author: srprawinraja

src/main/java/com/thealgorithms/datastructures/lists/SinglyLinkedList.java

@@ -396,15 +396,6 @@ public void checkBounds(int position, int low, int high) {
         }
     }
 
-    public int poll(){
-        if(head==null){
-            return -1;
-        }
-        int headValue=head.value;
-        head=head.next;
-        return headValue;
-    }
-    
     /**
      * Driver Code
      */
@@ -435,8 +426,7 @@ public static void main(String[] arg) {
         assert list.toString().equals("7->3");
         System.out.println(list);
         assert list.size == 2 && list.size() == list.count();
-        /* Test poll function */
-        System.out.println("pop element from head "+list.poll());
+
         list.clear();
         assert list.isEmpty();