1 /* 2 * Licensed to the Apache Software Foundation (ASF) under one or more 3 * contributor license agreements. See the NOTICE file distributed with 4 * this work for additional information regarding copyright ownership. 5 * The ASF licenses this file to You under the Apache License, Version 2.0 6 * (the "License"); you may not use this file except in compliance with 7 * the License. You may obtain a copy of the License at 8 * 9 * http://www.apache.org/licenses/LICENSE-2.0 10 * 11 * Unless required by applicable law or agreed to in writing, software 12 * distributed under the License is distributed on an "AS IS" BASIS, 13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 14 * See the License for the specific language governing permissions and 15 * limitations under the License. 16 */ 17 18 package java.io; 19 20 /** 21 * Defines an interface for classes that want to be serializable, but have their 22 * own binary representation. 23 */ 24 public interface Externalizable extends Serializable { 25 /** 26 * Reads the next object from the ObjectInput <code>input</code>. 27 * 28 * @param input 29 * the ObjectInput from which the next object is read. 30 * @throws IOException 31 * if an error occurs attempting to read from {@code input}. 32 * @throws ClassNotFoundException 33 * if the class of the instance being loaded cannot be found. 34 */ readExternal(ObjectInput input)35 public void readExternal(ObjectInput input) throws IOException, 36 ClassNotFoundException; 37 38 /** 39 * Writes the receiver to the ObjectOutput <code>output</code>. 40 * 41 * @param output 42 * the ObjectOutput to write the object to. 43 * @throws IOException 44 * if an error occurs attempting to write to {@code output}. 45 */ writeExternal(ObjectOutput output)46 public void writeExternal(ObjectOutput output) throws IOException; 47 } 48