将集合&lt；String>转换为String[]数组

/**来 自 n o w j a v a . c o m**/


//package com.nowjava;

import java.util.ArrayList;

import java.util.Collection;


import java.util.List;


public class Main {

    public static void main(String[] argv) {

        Collection c = java.util.Arrays.asList("asdf", "nowjava.com");

        System.out.println(java.util.Arrays.toString(convert(c)));

    }


    public static String[] convert(Collection<String> c) {

        if (c == null)

            return null;

            /** 
             来自 N o  w  J a v a . c o m - 时  代  Java**/

        String[] r = new String[c.size()];

        int i = 0;

        for (String s : c) {

            r[i] = s;

            i++;

        }

        return r;

    }


    public static List<String> convert(String[] c) {

        List<String> l = new ArrayList<String>();