Here you can find the source of toString(Iterable> names)
public static String toString(Iterable<?> names)
//package com.java2s; /*//ww w. j ava 2s. c o m * Copyright 2010 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 { public static String toString(Iterable<?> names) { Formatter formatter = new Formatter(); boolean first = true; for (Object name : names) { if (first) { formatter.format("'%s'", name); first = false; } else { formatter.format(", '%s'", name); } } return formatter.toString(); } }