Here you can find the source of length(String string)
public static int length(String string)
//package com.java2s; /**//from w ww . j av a 2 s .c om * Copyright 2010 Molindo GmbH * * 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. */ public class Main { public static int length(String string) { return string == null ? 0 : string.length(); } public static int length(String... strings) { int length = 0; for (int i = 0; i < strings.length; i++) { length += length(strings[i]); } return length; } }