test/tools/javac/generics/Nonlinear.java

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  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 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 4607420
  27  * @summary A bug in the original JSR14 generics specification
  28  *          created a loophole in the type system.
  29  *
  30  * @compile/fail -source 1.5 Nonlinear.java
  31  */
  32 
  33 
  34 public class Nonlinear {
  35 
  36     // This is an example of lack of type safety for
  37     // the version of javac from jsr14_adding_generics-1_0-ea
  38 
  39     // It is a variant of the "classic" problem with polymorphic
  40     // references in SML, which resulted in the usual array of
  41     // fixes: notably value polymorphism.
  42 
  43     // This code compiles, but produces a ClassCastException
  44     // when executed, even though there are no explicit casts in
  45     // the program.
  46 
  47     public static void main (String [] args) {
  48         Integer x = new Integer (5);
  49         String y = castit (x);
  50         System.out.println (y);




  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 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 4607420
  27  * @summary A bug in the original JSR14 generics specification
  28  *          created a loophole in the type system.
  29  *
  30  * @compile/fail  Nonlinear.java
  31  */
  32 
  33 
  34 public class Nonlinear {
  35 
  36     // This is an example of lack of type safety for
  37     // the version of javac from jsr14_adding_generics-1_0-ea
  38 
  39     // It is a variant of the "classic" problem with polymorphic
  40     // references in SML, which resulted in the usual array of
  41     // fixes: notably value polymorphism.
  42 
  43     // This code compiles, but produces a ClassCastException
  44     // when executed, even though there are no explicit casts in
  45     // the program.
  46 
  47     public static void main (String [] args) {
  48         Integer x = new Integer (5);
  49         String y = castit (x);
  50         System.out.println (y);