Queue using stack dequeue efficent

#1

How these primary, secondary stacks are created?
can we use this is dequeue efficient class
Stack primary=new Stack();
Stack secondary= new Stack();

#2

@minal.251298,
Use:
Stack primary = new Stack();
Stack Secondary = new Stack();

You can use the Stack class to create 2 objects of the stack class. 2 objects are primary and secondary. The type of the objects is Integer, that means they will store integer values.

#3

one more doubt is if i am saving Dequeuefficient class in another file named dequeuefficient.java, it is showing Dequeuefficient.java:7: error: cannot find symbol Stack primary = new Stack(); ^ symbol: class Stack location: class Dequeuefficient

#4

@minal.251298,
You need to import the class as well in that case.