added peek() method and stack is now printed vertically

Data Structures/Stacks/StackOfLinkedList.java

@@ -15,6 +15,7 @@ class StackOfLinkedList {
         stack.push(2);
         stack.push(3);
         stack.push(4);
+        stack.push(5);
 
         stack.printStack();
 
@@ -23,6 +24,8 @@ class StackOfLinkedList {
         stack.pop();
         stack.pop();
 
+        System.out.println("Top element of stack currently is: " + stack.peek());
+
     }
 
 }
@@ -75,12 +78,20 @@ class LinkedListStack {
         System.out.println("Popped element is: " + temp.data);
     }
 
+    public int peek() {
+      if (getSize() == 0) {
+        return -1;
+      }
+
+      return head.data;
+    }
+
     public void printStack() {
 
         Node temp = head;
         System.out.println("Stack is printed as below: ");
         while (temp != null) {
-            System.out.print(temp.data + " ");
+            System.out.println(temp.data + " ");
             temp = temp.next;
         }
         System.out.println();