[jdk11u-dev] RFR: 8320798: Console read line with zero out should zero out underlying buffer

[Goetz Lindenmaier]

A fix we should have in 11., backported from 17.
Basically the same change, but I had to adapt the instanceof statements to syntax of 11.

-------------

Commit messages:
 - Backport 48c847836e44aec2d5be4aaa3040dffc9d95fad5

Changes: https://git.openjdk.org/jdk11u-dev/pull/2400/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk11u-dev&pr=2400&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8320798
  Stats: 21 lines in 2 files changed: 21 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk11u-dev/pull/2400.diff
  Fetch: git fetch https://git.openjdk.org/jdk11u-dev.git pull/2400/head:pull/2400

PR: https://git.openjdk.org/jdk11u-dev/pull/2400