Here you can find the source of toString(Object[] array)
public static String toString(Object[] array)
//package com.java2s; /**/*ww w . ja v a 2 s . co m*/ * Copyright ? 2013 - 2017 WaveMaker, Inc. * * 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.Collection; import java.util.Iterator; public class Main { public static String toString(Object[] array) { return toString(array, ", "); } public static String toString(Object[] array, String sep) { if (array == null) { return null; } StringBuilder sb = new StringBuilder(); for (int i = 0; i < array.length; i++) { sb.append(String.valueOf(array[i])); if (i < array.length - 1) { sb.append(sep); } } return sb.toString(); } public static <T> String toString(Collection<T> c) { return toString(c, ", "); } public static <T> String toString(Collection<T> c, String sep) { StringBuilder sb = new StringBuilder(); for (Iterator<T> iter = c.iterator(); iter.hasNext();) { sb.append(String.valueOf(iter.next())); if (iter.hasNext()) { sb.append(sep); } } return sb.toString(); } }