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  1. JDK
  2. JDK-5065215

javac reports unnecessary unchecked warning

    Details

    • Subcomponent:
    • CPU:
      generic
    • OS:
      solaris_8

      Description

      See
      http://forum.java.sun.com/thread.jsp?forum=316&thread=530883&tstart=0&trange=50

      Because arrays are covariant, there should be no unchecked warning in the
      following code. Removing the cast causes the warning to go away.

      ==========$ cat X.java
      class X {
          static <T, U extends T> T[] cast(U[] a) { return (T[]) a; }
      }
      ==========$ javac X.java -Xlint
      X.java:2: warning: [unchecked] unchecked cast
      found : U[]
      required: T[]
          static <T, U extends T> T[] cast(U[] a) { return (T[]) a; }
                                                                 ^
      1 warning
      ==========$

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              • Assignee:
                ahe Peter Ahe
                Reporter:
                gafter Neal Gafter
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