Java Stack Class Quiz

The Stack class in Java is based on the basic principle of last-in-first-out, where the last element added to the stack is the first one to be removed. It models and implements a stack data structure following this principle.

The Stack class in Java can be said to extend Vector and treat the class as a stack with the mentioned functions. It can also be referred to as the subclass of Vector, indicating its relationship with the Vector class.

Apart from the basic push and pop operations, the Stack class in Java provides three more functions: empty, search, and peek. These functions allow checking if the stack is empty, searching for an element in the stack, and peeking at the element on the top of the stack without removing it.

To add an element to the stack using the Stack class in Java, the push() method is used. This operation places the element at the top of the stack, following the last-in-first-out principle.

The Stack class in Java supports one default constructor, Stack(), which is used to create an empty stack. It is used to instantiate a new empty stack without any initial elements.

A stack can be implemented using a singly linked list by performing stack operations (such as push, pop, peek, and display) based on the last in first out (LIFO) principle. The advantage of using a linked list over arrays for stack implementation is that a linked list can shrink or grow as needed, whereas an array has a fixed capacity which can lead to stack overflow.

The top pointer in the implementation of a stack using a singly linked list points to the head of the stack, where pushing and popping items occur. It keeps track of the last node in the stack.

In a stack implemented using a singly linked list, the push operation adds a new node to the top of the stack. This involves creating a new node and updating the top pointer to point to the new node.

Dynamic memory allocation in the implementation of a stack using a singly linked list allows each new node to be dynamically allocated, preventing overflow and enabling the stack to grow as needed.

The singly linked list concept enables LIFO operations in a stack by allowing the last node added to the list to be the first one removed, aligning with the LIFO principle of a stack.