1/* 2 * Copyright (c) 2004, 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. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 24/** 25 * @test 26 * @bug 5030063 27 * @summary Basic tests for flush(). 28 */ 29 30import java.io.Closeable; 31import java.io.Flushable; 32import java.util.Formatter; 33import java.util.FormatterClosedException; 34 35public class Flush { 36 37 private static class ExpectedException extends RuntimeException {} 38 39 private static class F implements Appendable, Closeable, Flushable { 40 public Appendable append(CharSequence csq) { return null; } 41 public Appendable append(char c) { return null; } 42 public Appendable append(CharSequence csq, int s, int e) { 43 return null; 44 } 45 public void close() {} 46 47 public void flush() { 48 throw new ExpectedException(); 49 } 50 } 51 52 private static class NF implements Appendable, Closeable { 53 public Appendable append(CharSequence csq) { return null; } 54 public Appendable append(char c) { return null; } 55 public Appendable append(CharSequence csq, int s, int e) { 56 return null; 57 } 58 public void close() {} 59 60 // method coincidentally called flush() 61 public void flush() { 62 throw new RuntimeException("NF.flush should not be called"); 63 } 64 } 65 66 private static void test(Formatter f) { 67 if (f.out() instanceof F) { 68 // F.flush() called since F implements Flushable 69 try { 70 f.flush(); 71 throw new RuntimeException("F.flush not called"); 72 } catch (ExpectedException x) { 73 System.out.println(" F.flush called"); 74 } 75 } else { 76 // NF.flush() not called since NF does not implement Flushable 77 f.flush(); 78 } 79 80 // Formatter is a Flushable 81 if (!(f instanceof Flushable)) 82 throw new RuntimeException("Formatter is not a Flushable"); 83 84 // flush() after close() throws a FormatterClosedException 85 f.close(); 86 try { 87 f.flush(); 88 throw new RuntimeException("FormatterClosedException not thrown"); 89 } catch (FormatterClosedException x) { 90 System.out.println(" FormatterClosedException thrown"); 91 } 92 } 93 94 public static void main(String [] args) { 95 System.out.println("testing Flushable"); 96 test(new Formatter(new F())); 97 System.out.println("testing non-Flushable"); 98 test(new Formatter(new NF())); 99 } 100} 101