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Bug ID: 6616323 consider benefits of replacing a componen array with other collection from the awt.Container class
6616323 : consider benefits of replacing a componen array with other collection from the awt.Container class

Details
Type:
Enhancement
Submit Date:
2007-10-12
Status:
Closed
Updated Date:
2011-05-18
Project Name:
JDK
Resolved Date:
2011-05-18
Component:
client-libs
OS:
windows_2000
Sub-Component:
java.awt
CPU:
generic
Priority:
P4
Resolution:
Fixed
Affected Versions:
7
Fixed Versions:
7

Related Reports
Backport:
JDK-2161436 - consider benefits of replacing a componen array with other collection from the awt.Container class
Relates:
JDK-6784816 - Remove AWT tree lock from Container methods: getComponent, getComponents, getComponentCount
Relates:
JDK-6690068 - REG: serialization proccess throws NPE
Relates:
JDK-6698652 - REG: serialization proccess throws NPE
Relates:
JDK-6692619 - Component is missing after changing the z-order of the component & focus is not transfered in
Relates:
JDK-6697660 - Multiple JCK tests fails with java.lang.IllegalStateException for 6u10 b23

Sub Tasks

Description
java.awt.Container class stores all children in an array of Components:
1) its initial size is 0;
2) on changing the hierarchy of components (add/remove) it addresses the Arrays.copy(args) method;

Comments
EVALUATION

There is no visible improvements with startup2 and startup3 but it does observed with swingmark if Container use ArrayList instead of plaing array.
C:\ad153231\refworkload_1>efworkload_1\results\swingmark\comp_array_original_1 C
============================================================================
esults\swingmark  Benchmark         Samples        Mean     Stdev             Ge
omean Weight
  swingmark              30      907.52      3.77
============================================================================
esults\swingmark  Benchmark         Samples        Mean     Stdev   %Diff    P
 Significant
  swingmark              30      881.36      4.33   -2.88 0.000          Yes
============================================================================
  * - Not Significant: The %Diff for the mean could be noise. If there is
      an actual difference, more samples would be needed to detect it.
2008-01-25 
SUGGESTED FIX

http://spbweb.russia.sun.com/~ad153231/startup/webrev.6616323.replace_array/
2007-12-27 
EVALUATION

List collection might be applied. Performance testing should be accomplished to choose better collection type.
2007-12-27


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