StringUtils.java Source code

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Here is the source code for StringUtils.java

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/*
JSPWiki - a JSP-based WikiWiki clone.
    
Licensed to the Apache Software Foundation (ASF) under one
or more contributor license agreements.  See the NOTICE file
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regarding copyright ownership.  The ASF licenses this file
to you under the Apache License, Version 2.0 (the
"License"); you may not use this file except in compliance
with the License.  You may obtain a copy of the License at
    
   http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing,
software distributed under the License is distributed on an
"AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
KIND, either express or implied.  See the License for the
specific language governing permissions and limitations
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 */

import java.security.SecureRandom;
import java.util.Random;

public class StringUtils {

    /**
     *  Returns true, if the argument contains a number, otherwise false.
     *  In a quick test this is roughly the same speed as Integer.parseInt()
     *  if the argument is a number, and roughly ten times the speed, if
     *  the argument is NOT a number.
     *
     *  @since 2.4
     *  @param s String to check
     *  @return True, if s represents a number.  False otherwise.
     */

    public static boolean isNumber(String s) {
        if (s == null)
            return false;

        if (s.length() > 1 && s.charAt(0) == '-')
            s = s.substring(1);

        for (int i = 0; i < s.length(); i++) {
            if (!Character.isDigit(s.charAt(i)))
                return false;
        }

        return true;
    }
}