Convert a List of Strings to a comma delimited String. - Java java.lang

Java examples for java.lang:String Join

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Description

Convert a List of Strings to a comma delimited String.

Demo Code

/*// ww  w.j a  v  a  2 s .  co m
 * Copyright 2009-2013 the original author or authors.
 *
 * 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.
 */
//package com.java2s;

import java.util.Collection;
import java.util.Iterator;

public class Main {
    public static void main(String[] argv) throws Exception {
        Collection list = java.util.Arrays.asList("asdf", "java2s.com");
        System.out.println(collectionToCommaDelimitedString(list));
    }

    /**
     * Convert a List of Strings to a comma delimited String.
     *
     * @param list
     * @return Returns the List as a comma delimited String. Returns an empty
     *         String for a Null or empty list.
     */
    public static String collectionToCommaDelimitedString(
            Collection<String> list) {
        if (list == null || list.isEmpty()) {
            return "";
        }

        StringBuilder sb = new StringBuilder();
        final Iterator<String> it = list.iterator();

        while (it.hasNext()) {

            sb.append(it.next());

            if (it.hasNext()) {
                sb.append(", ");
            }
        }
        return sb.toString();
    }
}

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