Check whether the supplied character is a Hexadecimal character. - Java java.lang

Java examples for java.lang:char

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Description

Check whether the supplied character is a Hexadecimal character.

Demo Code

/* /*from   w  w w  .j a va  2s.c o  m*/
 * Licensed to Aduna under one or more contributor license agreements.  
 * See the NOTICE.txt file distributed with this work for additional 
 * information regarding copyright ownership. 
 *
 * Aduna licenses this file to you under the terms of the Aduna BSD 
 * License (the "License"); you may not use this file except in compliance 
 * with the License. See the LICENSE.txt file distributed with this work 
 * for the full License.
 *
 * 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.
 */
//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        int c = 2;
        System.out.println(isHex(c));
    }

    /**
     * Check whether the supplied character is a Hexadecimal character.
     * 
     * @param c
     * @return <code>true</code> if c is a hexadecimal character, <code>false</code> otherwise.
     */
    public static boolean isHex(int c) {
        return isNumber(c) || isUpperCaseHexLetter(c)
                || isLowerCaseHexLetter(c);
    }

    /**
     * Checks whether the supplied character is a number
     */
    public static boolean isNumber(int c) {
        return (c >= 48 && c <= 57); // 0 - 9
    }

    private static boolean isUpperCaseHexLetter(int c) {
        return (c >= 65 && c <= 70);
    }

    private static boolean isLowerCaseHexLetter(int c) {
        return (c >= 97 && c <= 102);
    }
}

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