Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information 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 under the License.
 */

public class Main {
    /**
     * <p>Converts the character to the Integer it represents, throwing an
     * exception if the character is not numeric.</p>
     * 
     * <p>This method coverts the char '1' to the int 1 and so on.</p>
     *
     * <pre>
     *   CharUtils.toIntValue('3')  = 3
     *   CharUtils.toIntValue('A')  throws IllegalArgumentException
     * </pre>
     *
     * @param ch  the character to convert
     * @return the int value of the character
     * @throws IllegalArgumentException if the character is not ASCII numeric
     */
    public static int toIntValue(char ch) {
        if (isAsciiNumeric(ch) == false) {
            throw new IllegalArgumentException("The character " + ch + " is not in the range '0' - '9'");
        }
        return ch - 48;
    }

    /**
     * <p>Converts the character to the Integer it represents, throwing an
     * exception if the character is not numeric.</p>
     * 
     * <p>This method coverts the char '1' to the int 1 and so on.</p>
     *
     * <pre>
     *   CharUtils.toIntValue('3', -1)  = 3
     *   CharUtils.toIntValue('A', -1)  = -1
     * </pre>
     *
     * @param ch  the character to convert
     * @param defaultValue  the default value to use if the character is not numeric
     * @return the int value of the character
     */
    public static int toIntValue(char ch, int defaultValue) {
        if (isAsciiNumeric(ch) == false) {
            return defaultValue;
        }
        return ch - 48;
    }

    /**
     * <p>Converts the character to the Integer it represents, throwing an
     * exception if the character is not numeric.</p>
     * 
     * <p>This method coverts the char '1' to the int 1 and so on.</p>
     *
     * <pre>
     *   CharUtils.toIntValue('3')  = 3
     *   CharUtils.toIntValue(null) throws IllegalArgumentException
     *   CharUtils.toIntValue('A')  throws IllegalArgumentException
     * </pre>
     *
     * @param ch  the character to convert, not null
     * @return the int value of the character
     * @throws IllegalArgumentException if the Character is not ASCII numeric or is null
     */
    public static int toIntValue(Character ch) {
        if (ch == null) {
            throw new IllegalArgumentException("The character must not be null");
        }
        return toIntValue(ch.charValue());
    }

    /**
     * <p>Converts the character to the Integer it represents, throwing an
     * exception if the character is not numeric.</p>
     * 
     * <p>This method coverts the char '1' to the int 1 and so on.</p>
     *
     * <pre>
     *   CharUtils.toIntValue(null, -1) = -1
     *   CharUtils.toIntValue('3', -1)  = 3
     *   CharUtils.toIntValue('A', -1)  = -1
     * </pre>
     *
     * @param ch  the character to convert
     * @param defaultValue  the default value to use if the character is not numeric
     * @return the int value of the character
     */
    public static int toIntValue(Character ch, int defaultValue) {
        if (ch == null) {
            return defaultValue;
        }
        return toIntValue(ch.charValue(), defaultValue);
    }

    /**
     * <p>Checks whether the character is ASCII 7 bit numeric.</p>
     *
     * <pre>
     *   CharUtils.isAsciiNumeric('a')  = false
     *   CharUtils.isAsciiNumeric('A')  = false
     *   CharUtils.isAsciiNumeric('3')  = true
     *   CharUtils.isAsciiNumeric('-')  = false
     *   CharUtils.isAsciiNumeric('\n') = false
     *   CharUtils.isAsciiNumeric('&copy;') = false
     * </pre>
     * 
     * @param ch  the character to check
     * @return true if between 48 and 57 inclusive
     */
    public static boolean isAsciiNumeric(char ch) {
        return ch >= '0' && ch <= '9';
    }
}