Question

i have a string and i need a utility method which looks for bad character presence in the string and return some flag on that. Thanks for help in advance

Answer 1

Use regular expressions to define what characters do you want to appear in a string. If something else appears, report it somehow.

Simple example:

String s = "humbapumpa jim";
if (!s.matches("[a-zA-Z]+")) return false;

Or from the other side: define your “bad” characters and fire alert if they appear.

String s = "humbapumpa jim";
if (s.matches("[a]+")) return false;

More info on regular expressions in Java: http://www.vogella.com/articles/JavaRegularExpressions/article.html