Java String Whitespace Delete deleteWhitespace(String str)

Description

Deletes all whitespaces from a String as defined by Character#isWhitespace(char) .

License

Open Source License

Parameter

Parameter	Description
str	the String to delete whitespace from, may be null

Return

the String without whitespaces, null if null String input

Declaration

public static String deleteWhitespace(String str) 

Method Source Code

//package com.java2s;
/*******************************************************************************
 * Copyright (c) 2011 MadRobot.//from   w  w w .  j ava  2s.  c om
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Lesser Public License v2.1
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * 
 * Contributors:
 *  Elton Kent - initial API and implementation
 ******************************************************************************/

public class Main {
    /**
     * <p>
     * Deletes all whitespaces from a String as defined by
     * {@link Character#isWhitespace(char)}.
     * </p>
     * 
     * <pre>
     * StringUtils.deleteWhitespace(null)         = null
     * StringUtils.deleteWhitespace("")           = ""
     * StringUtils.deleteWhitespace("abc")        = "abc"
     * StringUtils.deleteWhitespace("   ab  c  ") = "abc"
     * </pre>
     * 
     * @param str
     *            the String to delete whitespace from, may be null
     * @return the String without whitespaces, <code>null</code> if null String
     *         input
     */
    public static String deleteWhitespace(String str) {
        if (isBlank(str)) {
            return str;
        }
        int sz = str.length();
        char[] chs = new char[sz];
        int count = 0;
        for (int i = 0; i < sz; i++) {
            if (!Character.isWhitespace(str.charAt(i))) {
                chs[count++] = str.charAt(i);
            }
        }
        if (count == sz) {
            return str;
        }
        return new String(chs, 0, count);
    }

    /**
     * <p>
     * Checks if a CharSequence is whitespace, empty ("") or null.
     * </p>
     * 
     * <pre>
     * StringUtils.isBlank(null)      = true
     * StringUtils.isBlank("")        = true
     * StringUtils.isBlank(" ")       = true
     * StringUtils.isBlank("bob")     = false
     * StringUtils.isBlank("  bob  ") = false
     * </pre>
     * 
     * @param cs
     *            the CharSequence to check, may be null
     * @return <code>true</code> if the CharSequence is null, empty or
     *         whitespace
     */
    public static boolean isBlank(CharSequence cs) {
        int strLen;
        if (cs == null || (strLen = cs.length()) == 0) {
            return true;
        }
        for (int i = 0; i < strLen; i++) {
            if ((Character.isWhitespace(cs.charAt(i)) == false)) {
                return false;
            }
        }
        return true;
    }

    /**
     * Gets a CharSequence length or <code>0</code> if the CharSequence is
     * <code>null</code>.
     * 
     * @param cs
     *            a CharSequence or <code>null</code>
     * @return CharSequence length or <code>0</code> if the CharSequence is
     *         <code>null</code>.
     */
    public static int length(CharSequence cs) {
        return cs == null ? 0 : cs.length();
    }
}

Related

1. deleteWhitespace(final String s)
2. deleteWhitespace(final String str)
3. deleteWhitespace(String s)
4. deleteWhiteSpace(String s)
5. deleteWhitespace(String str)
6. deleteWhitespace(String str)
7. deleteWhitespace(String str)
8. deleteWhitespace(String str)
9. deleteWhitespace(String str)