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POStacks dealing racognizng strings in a language, keep getting error, it's a array based implementation
 

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    <p>I am trying to implement an algorithm "recongnizng strings in a languages "</p> <blockquote> <p>L = {'w$w' : w is a possible empty string of characters other than $, w' = reverse(w)}</p> </blockquote> <p>I get an error saying where <code>ch = aString[i];</code> : the type of expression must be an array type but resolved to string</p> <p>also where <code>stackTop = aStack.pop();</code> but here however it's asking to cast to char</p> <p>' import java.util.Stack;</p> <p>public class Stacks {</p> <pre><code>public static void main(String[] args){ boolean eval = isInLanguage("sod$dos"); System.out.println(eval); } static // astack.createStack(); boolean isInLanguage(String aString){ Stack&lt;Character&gt; aStack = new Stack&lt;&gt;(); int i = 0; char ch = aString.charAt(i); while (ch != '$') { aStack.push(ch); i++; } //Skip the $ ++i; // match the reverse of w boolean inLanguage = true; // assume string is in language while (inLanguage &amp;&amp; i &lt; aString.length()) { char stackTop; ch = aString.charAt(i);; try { stackTop = (char) aStack.pop(); if (stackTop == ch) { i++; } else { // top of stack is not ch(Charecter do not match) inLanguage = false; // reject string } } catch (StackException e) { // aStack.poo() failed, astack is empty (first, half of Stirng // is short than second half) inLanguage = false; } } if (inLanguage &amp;&amp; aStack.isEmpty()) { return true; } else{ return false; } } </code></pre> <p>}</p> <p>'</p> <p>I just made the necessary changes but now, it will compile but it doesnt seem to stop and doesn't output anything, i am expecting a true in the console</p>
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