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stack

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Cover of Java Programming Interviews Exposed

Note

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 t...