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(gcj-300.info)Compatibility

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Compatibility with the Java Platform
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   As we believe it is important that the Java platform not be
fragmented, `gcj' and `libgcj' try to conform to the relevant Java
specifications.  However, limited manpower and incomplete and unclear
documentation work against us.  So, there are caveats to using `gcj'.

   This list of compatibility issues is by no means complete.

   * `gcj' implements the JDK 1.1 language.  It supports inner classes,
     though these are known to still be buggy.  It does not yet support
     the Java 2 `strictfp' keyword (it recognizes the keyword but
     ignores it).

   * `libgcj' is largely compatible with the JDK 1.2 libraries.
     However, `libgcj' is missing many packages, most notably
     `java.awt'.  There are also individual missing classes and methods.
     We currently do not have a list showing differences between
     `libgcj' and the Java 2 platform.

   * Sometimes the `libgcj' implementation of a method or class differs
     from the JDK implementation.  This is not always a bug.  Still, if
     it affects you, it probably makes sense to report it so that we
     can discuss the appropriate response.