Here you can find the source of closeAll(Iterable closeables)
static void closeAll(Iterable<? extends Closeable> closeables)
//package com.java2s; /******************************************************************************* * The MIT License (MIT)/*from w w w. j ava2s .com*/ * * Copyright (c) 2015 Daniel Huss * * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the * Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. ******************************************************************************/ import java.io.Closeable; import java.io.IOException; public class Main { static void closeAll(Iterable<? extends Closeable> closeables) { IOException caught = null; for (Closeable closeable : closeables) { try { if (closeable != null) closeable.close(); } catch (IOException e) { if (caught == null) caught = e; else caught.addSuppressed(e); } } if (caught != null) throw new IllegalStateException("Failed to close stream", caught); } }