import java.io.*; class CleanupPlain { void test() throws Exception { InputStream in = new FileInputStream("in"); try { OutputStream out = new FileOutputStream("out"); try { if (in.markSupported()) { out.flush(); } } finally { if (java.util.Collections.singletonList(out).get(0) != null) { out.close(); } } } finally { if (java.util.Collections.singletonList(in).get(0) != null) { in.close(); } } } }