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3.9 Keywords

The following character sequences, formed from ASCII letters, are reserved for use as keywords and cannot be used as identifiers (§3.8):

   Keyword: one of
       abstract     continue      for          new         switch
       assert       default       if           package synchronized
       boolean      do            goto         private     this
       break        double        implements   protected   throw
       byte         else          import       public      throws
       case         enum          instanceof   return      transient
       catch        extends       int          short       try
       char         final         interface    static      void
       class        finally       long         strictfp    volatile
       const        float         native       super       while

The keywords const and goto are reserved, even though they are not currently used. This may allow a Java compiler to produce better error messages if these C++ keywords incorrectly appear in programs.

While true and false might appear to be keywords, they are technically Boolean literals (§3.10.3). Similarly, while null might appear to be a keyword, it is technically the null literal (§3.10.7).

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