Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Copyright 2011 the original author or authors.
 *
 * 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 {
    /**
     * Creates a string with {@code toString()} of each object with the given separator.
     *
     * <pre>
     * expect:
     * join(",", new Object[]{"a"}) == "a"
     * join(",", new Object[]{"a", "b", "c"}) == "a,b,c"
     * join(",", new Object[]{}) == ""
     * </pre>
     *
     * The {@code separator} must not be null and {@code objects} must not be null.
     *
     * @param separator The string by which to join each string representation
     * @param objects The objects to join the string representations of
     * @return The joined string
     */
    public static String join(String separator, Object[] objects) {
        return join(separator, objects == null ? null : Arrays.asList(objects));
    }

    /**
     * Creates a string with {@code toString()} of each object with the given separator.
     *
     * <pre>
     * expect:
     * join(",", ["a"]) == "a"
     * join(",", ["a", "b", "c"]) == "a,b,c"
     * join(",", []) == ""
     * </pre>
     *
     * The {@code separator} must not be null and {@code objects} must not be null.
     *
     * @param separator The string by which to join each string representation
     * @param objects The objects to join the string representations of
     * @return The joined string
     */
    public static String join(String separator, Iterable<?> objects) {
        if (separator == null) {
            throw new NullPointerException("The 'separator' cannot be null");
        }
        if (objects == null) {
            throw new NullPointerException("The 'objects' cannot be null");
        }

        StringBuilder string = new StringBuilder();
        Iterator<?> iterator = objects.iterator();
        if (iterator.hasNext()) {
            string.append(iterator.next().toString());
            while (iterator.hasNext()) {
                string.append(separator);
                string.append(iterator.next().toString());
            }
        }
        return string.toString();
    }
}