hg: jdk8/tl/jdk: 6924259: Remove offset and count fields from java.lang.String (original) (raw)

Peter Levart peter.levart at gmail.com
Sun Jun 3 20:44:38 UTC 2012

On Thursday, May 31, 2012 03:22:35 AM mike.duigou at oracle.com wrote:

Changeset: 2c773daa825d Author: mduigou Date: 2012-05-17 10:06 -0700 URL: http://hg.openjdk.java.net/jdk8/tl/jdk/rev/2c773daa825d

6924259: Remove offset and count fields from java.lang.String Summary: Removes the use of shared character array buffers by String along with the two fields needed to support the use of shared buffers.

Wow, that's quite a change.

So .substring() is not O(1) any more?

Doesn't this have impact on the performance of parsers and such that rely on the performance caracteristics of the .substring() ?

Have you considered then implementing .subSequence() not in terms of just delegating to .substring() but returning a special CharSequence view over the chars of the sub-sequence?

Regards, Peter

Reviewed-by: alanb, mduigou, forax, briangoetz Contributed-by: brian.doherty at oracle.com

! src/share/classes/java/lang/Integer.java ! src/share/classes/java/lang/Long.java ! src/share/classes/java/lang/String.java ! src/share/classes/java/lang/StringCoding.java

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