![]() If the element is found, it returns the position of the element from the top of the stack. int search(Object element) : It determines whether an object exists in the stack.boolean empty() : It returns true if nothing is on the top of the stack.Object peek() : Returns the element on the top of the stack, but does not remove it. To implement a Queue using Stack datastructure, two stacks are sufficient: a stack for enqueuing and a stack for dequeuing.An ‘EmptyStackException’ exception is thrown if we call pop() when the invoking stack is empty. The task is to perform some operation on dequeue according to the queries as given below:1. Object pop() : Removes and returns the top element of the stack. A deque is a double-ended queue that allows enqueue and dequeue operations from both the ends.Object push(Object element) : Pushes an element on the top of the stack. ![]() Pre defined stack class in java has the following methods and you cannot modify it: Just understand that with predefined stack class, this is not valid: queue() What I did is, I made the primary and secondary stacks global and static and instead of doing this: primary.enqueue(i) you can just call the enqueue method and it will push the element. Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, Python, PHP, Bootstrap, Java. You can find the code in the ArrayDequeDemo class in the GitHub repository.The predefined stack class has some methods and you cannot add enqueue and dequeue to it. Therefore, we can grow and shrink the size of the array. Therefore, we cannot grow and shrink the size of an array once we created. ArrayDeque implements the Deque interface.
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