Java Collection to String toString(Collection c)

Description

Returns the given Collection as formatted String

License

Open Source License

Declaration

public static String toString(Collection<?> c) 

Method Source Code

//package com.java2s;
/*//from w w w. ja  v  a2s  . c  o  m
 * Mojito Distributed Hash Table (Mojito DHT)
 * Copyright (C) 2006-2007 LimeWire LLC
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

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

public class Main {
    /**
     * Returns the given Collection as formatted String
     */
    public static String toString(Collection<?> c) {
        StringBuilder buffer = new StringBuilder();

        Iterator it = c.iterator();
        for (int i = 0; it.hasNext(); i++) {
            buffer.append(i).append(": ").append(it.next()).append('\n');
        }

        // Delete the last \n
        if (buffer.length() > 1) {
            buffer.setLength(buffer.length() - 1);
        }
        return buffer.toString();
    }

    /**
     * Returns an iterator that returns up to max number of elements from the
     * Collection
     */
    private static <T> Iterator<T> iterator(final Collection<T> c, final int count) {
        return new Iterator<T>() {

            private final Iterator<T> it = c.iterator();

            private int item = 0;

            public boolean hasNext() {
                if (item >= count) {
                    return false;
                }
                return it.hasNext();
            }

            public T next() {
                if (!hasNext()) {
                    throw new NoSuchElementException();
                }
                item++;
                return it.next();
            }

            public void remove() {
                it.remove();
                item--;
            }
        };
    }
}

Related

1. toString(Collection objects)
2. toString(Collection setOfTests)
3. toString(Collection softwareTags)
4. toString(Collection collection)
5. toString(Collection collection, String prefix, String suffix)
6. toString(Collection c)
7. toString(Collection collection)
8. toString(Collection collection)
9. toString(Collection collection)