Java Collection Join joinSort(Collection c, String separator)

Description

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

License

Apache License

Declaration

public static <E extends Comparable<? super E>> String joinSort(Collection<E> c, String separator) 

Method Source Code

//package com.java2s;
/*/*from w  w w .ja va 2  s  .c o  m*/
 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 sorted and concatenated, separated by given separator */
    public static <E extends Comparable<? super E>> String joinSort(Collection<E> c, String separator) {
        if (c == null)
            return null;
        if (c.size() == 0)
            return "";
        int n = c.size(), count = 0;
        StringBuilder result = new StringBuilder();
        List<E> tmp = new ArrayList<E>(c);
        Collections.sort(tmp);
        for (E e : tmp) {
            result.append(e);
            count++;
            if (count < n) // no separator at the end
                result.append(separator);
        }
        return result.toString();
    }
}

Related

1. joinList(@SuppressWarnings("rawtypes") Collection c)
2. joinNullSafe(Collection collection, String separator)
3. joinObjects(Collection