Скачать или смотреть Selenium automation testing course with Java- Vector, Stack, ListIterator - class 23

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class 23:-
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What is the Vector and Stack in java collections?
Vector is a growable array of objects. It implements the List interface and is synchronized, which means it is thread-safe by default.

Key Features:
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Stores elements in insertion order
Allows duplicate elements
Allows null elements
Synchronized → thread-safe
Slower in single-threaded environments compared to ArrayList

common methods:-
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add(E e)
add(int index, E element)
remove(int index)
get(int index)
size()
capacity()-- ArrayList

Stack in Java
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Definition:
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Stack is a subclass of Vector that represents a Last-In-First-Out (LIFO) data structure. It provides additional methods for stack operations.

KeyFeatures:-
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Inherits all features of Vector
LIFO behavior
Synchronized

Stack Specific methods:-
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push(E item) // Pushes an item onto the top
pop() // Removes and returns the top item
peek() // Returns the top item without removing it
empty() // Checks if the stack is empty
search(Object o) // Finds the position from top (1-based)

Basic CRUD Operations
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Method Description
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boolean add(E e) Adds element to end of list
void add(int index, E element) Adds element at specific position
E get(int index) Gets element at index
E set(int index, E element) Replaces element at index
E remove(int index) Removes element at index
boolean remove(Object o) Removes first occurrence of object
void clear() Removes all elements

Size and Emptiness Checks
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Method Description
int size() Returns number of elements
boolean isEmpty() Checks if list is empty

Search Operations
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Method Description
boolean contains(Object o) Checks if element exists
int indexOf(Object o) Index of first occurrence
int lastIndexOf(Object o) Index of last occurrence