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1 /* |
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2 * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. |
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
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4 * |
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5 * This code is free software; you can redistribute it and/or modify it |
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6 * under the terms of the GNU General Public License version 2 only, as |
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7 * published by the Free Software Foundation. |
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8 * |
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9 * This code is distributed in the hope that it will be useful, but WITHOUT |
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
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12 * version 2 for more details (a copy is included in the LICENSE file that |
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13 * accompanied this code). |
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14 * |
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15 * You should have received a copy of the GNU General Public License version |
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16 * 2 along with this work; if not, write to the Free Software Foundation, |
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
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18 * |
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
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20 * CA 95054 USA or visit www.sun.com if you need additional information or |
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21 * have any questions. |
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22 */ |
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23 |
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24 /* |
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25 * @test |
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26 * @bug 5009712 |
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27 * @summary 1.4 javac should not accept the Covariant Return Type |
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28 * @author gafter |
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29 * |
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30 * @compile/fail -source 1.4 ExtendCovariant2.java |
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31 * @compile -source 1.5 ExtendCovariant2.java |
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32 */ |
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33 |
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34 /** |
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35 * java.io.PrintStream java.io.PrintStream.append(char) |
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36 * |
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37 * overrides |
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38 * |
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39 * java.lang.Appendable java.lang.Appendable.append(char) |
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40 * |
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41 * Yet javac should allow extending PrintStream, as long as the user |
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42 * doesn't directly override a covariant method in -source 1.4. |
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43 **/ |
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44 public class ExtendCovariant2 extends java.io.PrintStream { |
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45 ExtendCovariant2() throws java.io.IOException { |
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46 super(""); |
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47 } |
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48 public java.io.PrintStream append(char c) { |
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49 return this; |
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50 } |
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51 } |