Turns a sequence of objects into a string, delimited by separator. - Android java.lang

Android examples for java.lang:array

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Description

Turns a sequence of objects into a string, delimited by separator.

Demo Code

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

public class Main{

    /**/*from   w ww  .  ja  v  a  2  s  . c o  m*/
     * Turns a sequence of objects into a string, delimited by {@code sep}.  If a single
     * {@code Collection} is passed, it is assumed that the elements of that Collection are to be
     * joined.  Otherwise, wraps the passed {@link Object}(s) in a {@link List} and joins the
     * generated list.
     *
     * @param sep the string separator to delimit the different output segments.
     * @param pieces A {@link Collection} or a varargs {@code Array} of objects.
     */
    @SuppressWarnings("unchecked")
    public static String join(String sep, Object... pieces) {
        if ((pieces.length == 1) && (pieces[0] instanceof Collection)) {
            // Don't re-wrap the Collection
            return internalJoin(sep, (Collection<Object>) pieces[0]);
        } else {
            return internalJoin(sep, Arrays.asList(pieces));
        }
    }
    private static String internalJoin(String sep, Collection<Object> pieces) {
        StringBuilder sb = new StringBuilder();
        boolean skipSep = true;
        Iterator<Object> iter = pieces.iterator();
        while (iter.hasNext()) {
            if (skipSep) {
                skipSep = false;
            } else {
                sb.append(sep);
            }

            Object obj = iter.next();
            if (obj == null) {
                sb.append("null");
            } else {
                sb.append(obj.toString());
            }
        }
        return sb.toString();
    }

}

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