Checks whether the supplied character is a letter or number. - Java java.lang

Java examples for java.lang:Assert

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Description

Checks whether the supplied character is a letter or number.

Demo Code

/* //from   www  .j  a  va  2s. co 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(isLetterOrNumber(c));
    }

    /**
     * Checks whether the supplied character is a letter or number.
     * 
     * @see #isLetter
     * @see #isNumber
     */
    public static boolean isLetterOrNumber(int c) {
        return isLetter(c) || isNumber(c);
    }

    /**
     * Checks whether the supplied character is a letter.
     */
    public static boolean isLetter(int c) {
        return isUpperCaseLetter(c) || isLowerCaseLetter(c);
    }

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

    /**
     * Checks whether the supplied character is an upper-case letter.
     */
    public static boolean isUpperCaseLetter(int c) {
        return (c >= 65 && c <= 90); // A - Z
    }

    /**
     * Checks whether the supplied character is an lower-case letter.
     */
    public static boolean isLowerCaseLetter(int c) {
        return (c >= 97 && c <= 122); // a - z
    }
}

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