java版进栈出栈及字符串逆序

package org.stack;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.ObjectInputStream.GetField;
import java.util.Scanner;

class StackX {

	private int maxSize;
	private char[] stackArray;
	private int top;
	
	public StackX(int max)
	{
		maxSize = max;
		stackArray = new char[maxSize];
		top=-1;
	}
	
	public void push(char c)
	{
		stackArray[++top]=c;
	}
	public char pop()
	{
		return stackArray[top--];
	}
	public char peek()
	{
		return stackArray[top];
		
	}
	public boolean isEmpty()
	{
		return (top==-1);
	}

}
class Reverse
{
	private String input;
	private String output;
	
	public Reverse(String in)
	{
		input = in;
	}
	public String doRev()
	{
		int stackSize = input.length();
		StackX theStack = new StackX(stackSize);
		for(int i=0;i<stackSize;i++)
		{
			char ch = input.charAt(i);
			theStack.push(ch);
		}
		output=" ";
		while(!theStack.isEmpty())
		{
			char ch = theStack.pop();
			output = output+ch;
		}
		return output;
	}
}
public class ReversApp
{
	public static void main(String[] args) throws IOException {
		String input,output;
		while(true)
		{
			System.out.println("Enter a string:");
			//Scanner in = new Scanner(System.in);
			input = getString();
			if(input.equals(""))
			{
				break;
			}
			Reverse r = new Reverse(input);
			output = r.doRev();
			System.out.println(output);
			
		}
	}

	private static String getString() throws IOException {
		InputStreamReader is = new InputStreamReader(System.in);
		BufferedReader br = new BufferedReader(is);
		String s = br.readLine();
		return s;
	}
}