Here you can find the source of getByName(String host)
public static InetAddress getByName(String host) throws UnknownHostException
//package com.java2s; /**//w w w. ja v a 2 s .com * Copyright (C) 2008 10gen 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.net.*; public class Main { public static InetAddress getByName(String host) throws UnknownHostException { if (host == null) throw new NullPointerException("can't lookup null host"); return InetAddress.getByName(host); } }