Java Collection to String toString(final Collection c)

Description

Build a string from the collection.

License

MIT License

Parameter

Parameter	Description
T	Collection type.
c	Collection to use.

Return

A string containing all the collection values, or "null" if parameter is null.

Declaration

static <T> String toString(final Collection<T> c) 

Method Source Code

//package com.java2s;
/*//from  w ww  .j  ava 2s .  c om
 * This file is part of the Yildiz-Engine project, licenced under the MIT License  (MIT)
 *
 * Copyright (c) 2017 Gr?gory Van den Borre
 *
 * More infos available: https://www.yildiz-games.be
 *
 * 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 java.util.Collection;

public class Main {
    /**
     * Build a string from the collection. Every object contained has its
     * toString result separated by comma.
     *
     * @param <T> Collection type.
     * @param c   Collection to use.
     * @return A string containing all the collection values, or "null" if
     * parameter is <code>null</code>.
     */
    static <T> String toString(final Collection<T> c) {
        if (c == null) {
            return "null";
        } else if (c.isEmpty()) {
            return "";
        }
        StringBuilder sb = new StringBuilder();
        for (T t : c) {
            sb.append(t.toString());
            sb.append(',');
        }
        sb.deleteCharAt(sb.length() - 1);
        return sb.toString();
    }

    /**
     * Call toString method of object and handle <code>null</code> cases by
     * returning "null".
     *
     * @param object Object to get String value.
     * @return The object toString value or "null" if the parameter is
     * <code>null</code>.
     */
    static String toString(final Object object) {
        if (object == null) {
            return "null";
        }
        return object.toString();
    }
}

Related

1. toString(final Collection collection)
2. toString(final Collection collection, final String separator)
3. toString(final Collection objs)
4. toString(final Collection values)
5. toString(final Collection list, final String delimiter)
6. toString(String[] collection, char separator)
7. toStrings(Collection vals)
8. toStrings(Collection c)
9. toStrings(Collection objects)