Returns true if the specified character is a whitespace character (CR, LF, SP or HT). - Java Internationalization

Java examples for Internationalization:Charset

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Description

Returns true if the specified character is a whitespace character (CR, LF, SP or HT).

Demo Code

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 * regarding copyright ownership.  The ASF licenses this file   *
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//package com.java2s;

public class Main {
    public static void main(String[] argv) throws Exception {
        char ch = 'a';
        System.out.println(isWhitespace(ch));
    }//from w  w w.  j av  a  2s.com

    /** US-ASCII CR, carriage return (13) */
    public static final int CR = '\r';
    /** US-ASCII LF, line feed (10) */
    public static final int LF = '\n';
    /** US-ASCII SP, space (32) */
    public static final int SP = ' ';
    /** US-ASCII HT, horizontal-tab (9) */
    public static final int HT = '\t';

    /**
     * Returns <code>true</code> if the specified character is a whitespace
     * character (CR, LF, SP or HT).
     *
     * @param ch
     *            character to test.
     * @return <code>true</code> if the specified character is a whitespace
     *         character, <code>false</code> otherwise.
     */
    public static boolean isWhitespace(char ch) {
        return ch == SP || ch == HT || ch == CR || ch == LF;
    }

    /**
     * Returns <code>true</code> if the specified string consists entirely of
     * whitespace characters.
     *
     * @param s
     *            string to test.
     * @return <code>true</code> if the specified string consists entirely of
     *         whitespace characters, <code>false</code> otherwise.
     */
    public static boolean isWhitespace(final String s) {
        if (s == null) {
            throw new IllegalArgumentException("String may not be null");
        }
        final int len = s.length();
        for (int i = 0; i < len; i++) {
            if (!isWhitespace(s.charAt(i))) {
                return false;
            }
        }
        return true;
    }
}

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