test/tools/javac/mixedTarget/ExtendCovariant2.java

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  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 5009712
  27  * @summary 1.4 javac should not accept the Covariant Return Type
  28  * @author gafter
  29  *
  30  * @compile/fail -source 1.4 ExtendCovariant2.java
  31  * @compile -source 1.5 ExtendCovariant2.java
  32  */
  33 
  34 /**
  35  * java.io.PrintStream java.io.PrintStream.append(char)
  36  *
  37  * overrides
  38  *
  39  * java.lang.Appendable java.lang.Appendable.append(char)
  40  *
  41  * Yet javac should allow extending PrintStream, as long as the user
  42  * doesn't directly override a covariant method in -source 1.4.
  43  **/
  44 public class ExtendCovariant2 extends java.io.PrintStream {
  45     ExtendCovariant2() throws java.io.IOException {
  46         super("");
  47     }
  48     public java.io.PrintStream append(char c) {
  49         return this;
  50     }
  51 }


  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  20  * CA 95054 USA or visit www.sun.com if you need additional information or
  21  * have any questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug 5009712
  27  * @summary 1.4 javac should not accept the Covariant Return Type
  28  * @author gafter
  29  *
  30  * @compile/fail -source 1.4 ExtendCovariant2.java
  31  * @compile                  ExtendCovariant2.java
  32  */
  33 
  34 /**
  35  * java.io.PrintStream java.io.PrintStream.append(char)
  36  *
  37  * overrides
  38  *
  39  * java.lang.Appendable java.lang.Appendable.append(char)
  40  *
  41  * Yet javac should allow extending PrintStream, as long as the user
  42  * doesn't directly override a covariant method in -source 1.4.
  43  **/
  44 public class ExtendCovariant2 extends java.io.PrintStream {
  45     ExtendCovariant2() throws java.io.IOException {
  46         super("");
  47     }
  48     public java.io.PrintStream append(char c) {
  49         return this;
  50     }
  51 }