Dataflow laundering with exceptions

ExceptionalLaunder.java

/**
 * A toy example of laundering data through the use of the program stack and exception control flow paths
 * The input data drives how two methods recursively call each other.  If the next input value is a 0 then
 * the _0 method is called, likewise a 1 calls the _1 method.  When there is no more data an Exception is thrown
 * with the following stack trace.  The Exception is caught and the stack trace is used to recover the data. 
 * 
 * java.lang.StringIndexOutOfBoundsException: String index out of range: 0
 *	at java.lang.String.charAt(String.java:658)
 *	at ExceptionalLaunder._0(ExceptionalLaunder.java:39)
 *	at ExceptionalLaunder._1(ExceptionalLaunder.java:48)
 *	at ExceptionalLaunder._0(ExceptionalLaunder.java:42)
 *	at ExceptionalLaunder._1(ExceptionalLaunder.java:48)
 *	at ExceptionalLaunder.launder(ExceptionalLaunder.java:22)
 *	at ExceptionalLaunder.main(ExceptionalLaunder.java:12)
 * 
 *@author Ben Holland
 */
public class ExceptionalLaunder {

	public static void main(String[] args) {
		String x = "1010";
		String y = launder(x);
		System.out.println(y + " is a laundered version of " + x);
	}

	public static String launder(String data) {
		String result = "";
		try {
			if (data.charAt(0) == '0'){
				_0(data.substring(1));
			} else{
				_1(data.substring(1));
			}
		} catch (Exception e) {
			e.printStackTrace();
			StackTraceElement[] stack = e.getStackTrace();
			StringBuilder temp = new StringBuilder("");
			for(StackTraceElement element : stack){
				if(element.getMethodName().substring(0,1).equals("_")){
					temp.append(element.getMethodName().replace("_", ""));
				}
			}
			result = temp.reverse().toString();
		}
		return result;
	}

	private static void _0(String data) {
		if (data.charAt(0) == '0'){
			_0(data.substring(1));
		} else {
			_1(data.substring(1));
		}
	}

	private static void _1(String data) {
		if (data.charAt(0) == '0'){
			_0(data.substring(1));
		} else {
			_1(data.substring(1));
		}
	}
}