Taking punctuation marks and spaces out've a string

Posted on 2008-10-10
Last Modified: 2012-05-05
I am writing some code where i have to reverse a word, place only alphabetical characters onto the stack and the queue, and convert all uppercase letters to lowercase and check to see if its a palindrome and im supposed to use a Queue and a Stack.

So my question is, how do i implement sometime of checking to make sure i only put alphabetical characters onto the stack?

The input file im using will only have spaces and punctuation marks.
import java.util.*;


import java.lang.*;


class LetterStack


	private int maxSize;

	private char[] stackArray;

	private int top;


	public LetterStack(int max)


		maxSize = max;

		stackArray = new char[maxSize];

		top = -1;


	public void push(char j)


		stackArray[++top] = j;


	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();

	LetterStack tehStack = new LetterStack(stackSize);

	for(int j=0; j<input.length(); j++)


		char ch = input.charAt(j);



	output = "";

	while( !tehStack.isEmpty() )


		char ch = tehStack.pop();

		output = output + ch;


	return output;




public class PalindromeApp{

	public static void main (String[] args) throws IOException{

		String input,output;

		Scanner inFile = new Scanner(new FileReader(args[0]));

		PrintWriter outFile = new PrintWriter(args[1]);



			input = inFile.nextLine();

			Reverse  tehReverse = new Reverse(input);

			output = tehReverse.doRev();




				outFile.println("NOT PALINDROME");






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Question by:austinemser
1 Comment

Accepted Solution

gcauthon earned 500 total points
ID: 22690636
if (ch >= 'a' && ch <= 'z' || ch >= 'A' && ch <= 'Z') tehStack.push(ch);

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