JDK-4770188 : byte to char a narrowing conversion?
  • Type: Bug
  • Component: specification
  • Sub-Component: language
  • Affected Version: 1.4.0
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • OS: solaris_8
  • CPU: generic
  • Submitted: 2002-10-29
  • Updated: 2016-09-20
  • Resolved: 2002-10-30
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Other
5.0 tigerFixed
Related Reports
Relates :  
JDK-8166396 - 5.5: Clean up description of legal conversions in casts
Description
JLS 5.1.3 defines the byte to char conversion as a narrowing
conversion that simply discards bits.  That doesn't work because the
conversion adds bits, not removes bits.  Is the sign extended before
discarding bits or is the value padded with zeroes?  This is
completely unspecified in the JLS and implementations could differ.
Comments
CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: generic FIXED IN: tiger INTEGRATED IN: tiger VERIFIED IN: tiger
14-06-2004
PUBLIC COMMENTS A conversion from byte to char is both a widening and a narrowing conversion. First, the byte is widened to an int (and sign extended) and then it is narrowed to a char (and zero-extended, at the JVM level).
10-06-2004
EVALUATION True. Fixed in 3rd edition draft. ###@###.### 2002-10-29
29-10-2002