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There is a newer version: 6.1.1

package net.java.ao.util;

public final class StringUtils
{
    public static boolean isBlank(String s)
    {
        if (s == null || s.length() == 0)
        {
            return true;
        }
        for (int i = 0; i < s.length(); i++)
        {
            if (!Character.isWhitespace(s.charAt(i)))
            {
                return false;
            }
        }
        return true;
    }
}