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  1. JDK
  2. JDK-8253393

Formatter does not throw exception for 0 as argument index

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    Details

    • Type: Bug
    • Status: Closed
    • Priority: P4
    • Resolution: Duplicate
    • Affects Version/s: 8, 11, 14, 15
    • Fix Version/s: None
    • Component/s: core-libs
    • Subcomponent:
    • CPU:
      generic
    • OS:
      generic

      Description

      A DESCRIPTION OF THE PROBLEM :
      The documentation of java.util.Formatter (https://docs.oracle.com/en/java/javase/15/docs/api/java.base/java/util/Formatter.html#dpos) says regarding an explicit argument index:
      > The first argument is referenced by "1$"

      And regarding "Ordinary indexing":
      > Ordinary indexing is used when the format specifier contains neither an argument index nor a '<'

      However when using "0$" as explicit argument index, no exception is thrown but instead it is treated like "Ordinary indexing", i.e. the next sequential index is used.
      Expected would be that either:
      - An exception is thrown (preferred)
      - The documentation is adjusted

      EXPECTED VERSUS ACTUAL BEHAVIOR :
      EXPECTED -
      An exception to be thrown
      ACTUAL -
      Explicit index is treated like "Ordinary indexing"

      ---------- BEGIN SOURCE ----------
      String.format("%0$s %0$s", "a", "b")
      ---------- END SOURCE ----------

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              Assignee:
              igraves Ian Graves
              Reporter:
              webbuggrp Webbug Group
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                Updated:
                Resolved: