1 /* 2 * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package java.lang; 27 28 /** 29 * A resource that must be closed when it is no longer needed. 30 * 31 * @author Josh Bloch 32 * @since 1.7 33 */ 34 public interface AutoCloseable { 35 /** 36 * Close this resource, relinquishing any underlying resources. 37 * This method is invoked automatically by the automatic resource 38 * management block construct. 39 * 40 * <p>Classes implementing this method are strongly encouraged to 41 * be declared to throw more specific exceptions (or no exception 42 * at all, if the close cannot fail). 43 * 44 * <p>Note that unlike the {@link java.io.Closeable#close close} 45 * method of {@link java.io.Closeable}, this {@code close} method 46 * is <em>not</em> required to be idempotent. In other words, 47 * calling this {@code close} method more than once may have some 48 * visible side effect, unlike {@code Closeable.close} which is 49 * required to have no effect if called more than once. 50 * 51 * @throws Exception if this resource cannot be closed 52 */ 53 void close() throws Exception; 54 }