Java Collection Join join(Collection c, String separator)

Description

returns a string with elements of the given collection concatenated, separated by given separator

License

Apache License

Declaration

public static <E> String join(Collection<E> c, String separator) 

Method Source Code

//package com.java2s;
/*//from   w w w  . jav a  2 s .com
 * Copyright (C) 2012 The Stanford MobiSocial Laboratory
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * 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.
 */

import java.util.*;

public class Main {
    /**
     * returns a string with elements of the given collection concatenated,
     * separated by given separator
     */
    public static <E> String join(Collection<E> c, String separator) {
        if (c.size() == 0)
            return "";
        int n = c.size(), count = 0;
        StringBuilder result = new StringBuilder();
        for (E e : c) {
            result.append(e);
            count++;
            if (count < n) // no separator at the end
                result.append(separator);
        }
        return result.toString();
    }

    /**
     * returns a string with elements of the given array concatenated, separated
     * by given separator
     */
    public static <E> String join(E[] c, String separator) {
        if (c == null)
            return null;
        if (c.length == 0)
            return "";
        int n = c.length, count = 0;
        StringBuilder result = new StringBuilder();
        for (E e : c) {
            result.append(e);
            count++;
            if (count < n) // no separator at the end
                result.append(separator);
        }
        return result.toString();
    }
}

Related

1. join(Collection toJoin, String joinBy)
2. join(Collection tokens, String d)
3. join(Collection values)
4. join(Collection collection, String separator)
5. join(Collection data)
6. join(Collection args, String delimeter)
7. join(Collection c)
8. join(Collection c, String joinSymbol)
9. join(Collection coll, String delimiter)