Splitter01

public static Stack<String> splitter(String exp) {

		String str = exp.replaceAll("\\s", "");

		Stack<String> stack = new Stack<String>();
		Stack<String> ReverseStack = new Stack<String>();
		char[] cArr = str.toCharArray();

		Stack<String> stackOutput = new Stack<String>();
		String helper = "";
		char lastChar = ' ';


		for(int i = 0; i<str.length(); i++) {

            if (str.charAt(i) == ('-') && lastChar == '(') {
            	if(!stack.empty()) {
					while(!stack.empty())
						ReverseStack.push(stack.pop());

					while(!ReverseStack.empty())
						helper += ReverseStack.pop();

					stackOutput.push(helper);
					helper = "";
				}
				stack.push(String.valueOf(str.charAt(i)));


            }
		else if(str.charAt(i)  == ('(') ||  str.charAt(i) == ('+') ||  str.charAt(i) == (')')
				||str.charAt(i) == ('*') ||str.charAt(i) == ('/') ||str.charAt(i) == ('^') || str.charAt(i) == ('-') && i != 0 ){

				if(!stack.empty()) {
					while(!stack.empty())
						ReverseStack.push(stack.pop());

					while(!ReverseStack.empty())
						helper += ReverseStack.pop();

					stackOutput.push(helper);
					helper = "";
				}
				stack.push(String.valueOf(str.charAt(i)));

				if(!stack.empty()) {
					while(!stack.empty())
						ReverseStack.push(stack.pop());

					while(!ReverseStack.empty())
						helper += ReverseStack.pop();

					stackOutput.push(helper);
					helper = "";
				}
			}

            else
            	stack.push(String.valueOf(str.charAt(i)));

            lastChar = str.charAt(i);

		}

		if(!stack.empty()) {
		while(!stack.empty())
				ReverseStack.push(stack.pop());


			while(!ReverseStack.empty())
				helper += ReverseStack.pop();

			stackOutput.push(helper);
			helper = "";
		}

		return stackOutput;
	}