Using the class java.util.Stack, define a class OurStack that implements the interface Sta...

Using the class java.util.Stack, define a class OurStack that implements the interface StackInterface, as given in Listing.

LISTING 1 An interface for the ADT stack

public interface StackInterface{  /** Adds a new entry to the top of this stack.  @param newEntry an object to be added to the stack */  public void push(T newEntry);  /** Removes and returns this stack’s top entry.  @return either the object at the top of the stack or, if the  stack is empty before the operation, null */  public T pop();  /** Retrieves this stack’s top entry.  @return either the object at the top of the stack or null if  the stack is empty */  public T peek();  /** Detects whether this stack is empty.  @return true if the stack is empty */  public boolean isEmpty();  /** Removes all entries from this stack */  public void clear();} // end StackInterface