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Stack is not a Vector then why Stack class is extending(is a relationship) Vector class in JDK, Stack suppose to work with push() & pop() operations, but because it extends Vector I am able to do add() and remove() operations over a stack.
I think rather extending Vector class, Stack class should use Vector class as a composition.
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The Stack class represents a last-in-first-out (LIFO) stack of objects. It extends class Vector with five operations that allow a vector to be treated as a stack.
This is because Vector synchronizes on each operation and does not synchronize the whole Vector instance itself. This is not desired in real-world applications, where the whole set of operations needs to be synchronized and not individual operations.
Stack is a subclass of Vector that implements a standard last-in, first-out stack. Stack only defines the default constructor, which creates an empty stack. Stack includes all the methods defined by Vector, and adds several of its own.
The Vector class is used in Java to store data using the List interface. For instance, a Vector may be used to store a list of products sold at a department store or a list of supplements available at a local drug store.
Both Stack and Vector were included with the first release of Java. Java was rushed to market ahead of its time because of the Internet frenzy at that time.
Some of the classes bundled with those earliest versions of Java, such as the date-time classes, were not well thought-out. They had not been subjected to peer review and public scrutiny as were later libraries such as some produced through the Java Community Process and through open-source projects and industry consortium projects.
The Java Collections framework supplants both of these classes. Similarly, the java.time framework supplants the old date-time classes such as java.util.Date/.Calendar. The old classes remain in Java for backwards compatibility with existing apps but should not be used in new code.
The Stack class documentation tells you this, clearly saying you should instead be using an implementation of the Deque interface.
Diagram is by Ramlmn, published on Wikipedia. Modified by me to indicate Vector & Stack being obsolete.
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