● Create a stack interface called, StackInterface. You must usegenerics for this interface. (push(newEntry), pop(),peek(), isEmpty, clear()) In this interface you arerequired to include the javadoc for the preconditions andpostconditions for each method.
● Write two classes that implement StackInterface
○ ArrayStack: the stack is implemented using an array.
○ LinkedStack: the stack is implemented using a singly linkeddata chain
● Write a class that converts an infix expression to a postfixexpression using the algorithm. Name this classInfixToPostfixConverter and it should implement the interface,ExpressionConverterInterface (which will be provided)
public interface ExpressionConverterInterface { /** convert method converts one type of expression format to
PayPal Gateway not configured
PayPal Gateway not configured