Java Stack Implementation using Linked List

Java Stack Implementation using Linked List: In the last post, we learned Java Stack Implementation using Array. Here is the post which explains the implementation of the most useful data structure i.e. Stack using Linked List. First of all, we need to know what actually Stack is and what is its basic operations? So, let’s know about Stack.

Stack: A Stack is an abstract data type that follows a certain principle/rule for its set of operations i.e. insertion, deletion, search, etc. The principle followed by the stack is commonly known as LIFO (Last In First Out) or FILO (First In Last Out). i.e. the set of elements inserted first into the stack will be out at the last and the elements inserted last into the stack will be out first.

Java Stack Implementation using Linked List

Best real Life example to understand Stack: 

  1. A pile of plates in a canteen. The plates are stacked over one another using the LIFO order. The plate kept at first will be used and the plate kept at the bottom will be used at last.
  2. Undo and Redo process in the computer system: The process of undoing will fetch the last done activity from the Activity Stack and implement it similarly as Stack does through the principle of LIFO or FILO.
Stack Operations:
Basic Operations Descriptions of the Operations
 Push Insert a new element on the top of the stack. It throws  Overflow error if the stack is full.
 Pop Removes the topmost element from the stack. It throws Underflow error if the stack is Empty.
 Peek Returns the topmost element of the stack.
 Contains Check if the stack contains the specified element.
 isFull Check if the stack is full i.e. Stack’s capacity is equal to the total size of the stack.
 isEmpty Check if the stack is Empty.
 Size Returns the total size of the stack array.

Implementation of Stack using Linked List in Java: 

The output of the above code Implementation: 

That’s it for now. Hope you understood the concepts of Java Stack Implementation using Linked List now.

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