Java tutorial
//package com.java2s; /* * Copyright 2014-2016 OpenEstate.org. * * 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.URL; public class Main { /** * Write an {@link URL} value into XML output. * * @param value * value to write * * @return * XML string * * @throws IllegalArgumentException * if a validation error occured */ public static String printUrl(URL value) { if (value == null) { throw new IllegalArgumentException("The provided URL NULL is invalid!"); } return value.toString(); } }