Stack Class in Java

Java provides an inbuilt object type called Stack. It is a collection that is based on the last in first out (LIFO) principle. On Creation, a stack is empty.

It extends Vector class with five methods that allow a vector to be treated as a stack. The five methods are:

1. Object push(Object element) : Pushes an element on the top of the stack.

2. Object pop() : Removes and returns the top element of the stack. An ‘EmptyStackException’ exception is thrown if we call pop() when the invoking stack is empty.

3. Object peek( ) : Returns the element on the top of the stack, but does not remove it.

4. boolean empty() : It returns true if nothing is on the top of the stack. Else, returns false.

5. int search(Object element) : It determines whether an object exists in the stack. If the element is found, it returns the position of the element from the top of the stack. Else, it returns -1.

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