Join given tokens with given delimiter . - Java java.lang

Java examples for java.lang:String Join

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Description

Join given tokens with given delimiter .

Demo Code

/*/*from   ww w  .j  a  va 2  s.  co m*/
 * Copyright (c) 2010-2013 the original author or authors
 *
 * Permission is hereby granted, free of charge, to any person obtaining
 * a copy of this software and associated documentation files (the
 * "Software"), to deal in the Software without restriction, including
 * without limitation the rights to use, copy, modify, merge, publish,
 * distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to
 * the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
import javax.annotation.Nonnull;
import javax.annotation.Nullable;
import java.util.*;

public class Main{
    /**
     * Join given {@code tokens} with given {@code delimiter}.
     *
     * Sample: tokens {@code "com", "mycompany, "ecommerce", "server1"} with delimiter {@code "."}
     * returns {@code "com.mycompany.ecommerce.server1"}.
     *
     * @param tokens
     * @param delimiter
     * @return the joined tokens ({@code null} if given {@code tokens} is {@code null}
     */
    public static String join(@Nullable List<String> tokens,
            @Nonnull String delimiter) {
        if (tokens == null) {
            return null;
        }
        Preconditions2.checkNotNull(delimiter,
                "given delimiter can not be null");

        Iterator<String> it = tokens.iterator();
        StringBuilder sb = new StringBuilder();
        while (it.hasNext()) {
            String token = it.next();
            sb.append(token);
            if (it.hasNext()) {
                sb.append(delimiter);
            }
        }
        return sb.toString();
    }
}

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