TestStack.java

//TestStack.java
//Michael Crumm 2010-10-04

import java.io.*;
import java.util.Scanner;

import stack.*;

public class TestStack
{
	//Prompts the user for Integers and pushes them onto the stack.
	//The Stack's size and String representation are printed.
	//The Stack's pop method is called in a loop to display input
	//in reverse order.
	public static void main(String[] args) throws IOException
	{
		Stack theStack = new ArrayStack(5);
		readIntegersIntoStack(theStack);
		
		System.out.println("There are " + theStack.size() + " elements in the stack.");
		System.out.println("The stack: " + theStack.toString());
		
		System.out.println("Your data reversed:");
		removeIntegersFromStack(theStack);
	}
	
	//Reads a list of Integers from Standard Input and pushes them onto theStack
	public static void readIntegersIntoStack(Stack theStack) throws IOException
	{
		Scanner scanner = new Scanner(System.in);
		
		System.out.println("Enter a list of integers, one per line."
			+ "\n Press enter to stop.");
		
		String line = null;
		while(true) {
			line = scanner.nextLine();
			if(line.equals("")) {
				break;
			}
			theStack.push(new Integer(line));
		}
	}
	
	//Pops each element from theStack and prints it to Standard Output until
	//the stack is empty.
	public static void removeIntegersFromStack(Stack theStack)
	{
		while(!theStack.isEmpty()) {
			System.out.println(theStack.peek().toString());
			theStack.pop();
		}
		System.out.println("Stack is now empty.");
	}
}