Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright (C) 2011 The Android Open Source Project
 *
 * 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.Arrays;
import java.util.Collection;
import java.util.Iterator;

public class Main {
    /**
     * 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();
    }
}