Join array to string with separator.

Description

Demo Code


//package com.book2s;
import java.util.Iterator;

public class Main {
    public static void main(String[] argv) {
        Object[] array = new String[] { "1", "abc", "level", null,
                "book2s.com", "asdf 123" };
        String separator = "book2s.com";
        System.out.println(join(array, separator));
    }/*from  ww w .ja v a2 s  . c o  m*/

    /**
     * Join array to string with separator.
     * 
     * @param array
     * @param separator
     * @return array string
     */
    public static String join(Object[] array, String separator) {
        if (array == null) {
            return null;
        }

        StringBuilder buf = new StringBuilder(array.length * 16);
        for (int i = 0; i < array.length; i++) {
            if (i > 0) {
                buf.append(separator);
            }

            if (array[i] != null) {
                buf.append(array[i]);
            }
        }

        return buf.toString();
    }

    /**
     * Join collection to string with separator.
     * 
     * @param iterator
     * @param separator
     * @return array string
     */
    public static String join(Iterable<?> iterable, String separator) {
        if (iterable == null) {
            return null;
        }

        Iterator<?> iterator = iterable.iterator();

        if (!iterator.hasNext()) {
            return "";
        }

        Object first = iterator.next();
        if (!iterator.hasNext()) {
            return first == null ? "" : first.toString();
        }

        StringBuilder buf = new StringBuilder(256);
        if (first != null) {
            buf.append(first);
        }

        while (iterator.hasNext()) {
            buf.append(separator);

            Object obj = iterator.next();
            if (obj != null) {
                buf.append(obj);
            }
        }

        return buf.toString();
    }
}
Join array to string with separator. - Android java.lang

Description

Demo Code

Related Tutorials
