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8186958: Need method to create pre-sized HashMap

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Reviewed-by: chegar, naoto, joehw, lancea, wetmore, smarks
This commit is contained in:
XenoAmess 2022-04-19 00:03:56 +00:00 • committed by Stuart Marks
parent 41fc078323
commit 87faa85c59
30 changed files with 208 additions and 73 deletions
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7
src/java.base/share/classes/java/lang/Module.java
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@ -1,5 +1,5 @@
/*
* Copyright (c) 2014, 2021, Oracle and/or its affiliates. All rights reserved.
* Copyright (c) 2014, 2022, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -980,7 +980,7 @@ public final class Module implements AnnotatedElement {
// the packages to all unnamed modules.
Map<String, Set<Module>> openPackages = this.openPackages;
if (openPackages == null) {
openPackages = new HashMap<>((4 * (concealedPkgs.size() + exportedPkgs.size()) / 3) + 1);
openPackages = HashMap.newHashMap(concealedPkgs.size() + exportedPkgs.size());
} else {
openPackages = new HashMap<>(openPackages);
}
@ -1133,8 +1133,7 @@ public final class Module implements AnnotatedElement {
boolean isBootLayer = (ModuleLayer.boot() == null);
int numModules = cf.modules().size();
int cap = (int)(numModules / 0.75f + 1.0f);
Map<String, Module> nameToModule = new HashMap<>(cap);
Map<String, Module> nameToModule = HashMap.newHashMap(numModules);
// to avoid repeated lookups and reduce iteration overhead, we create
// arrays holding correlated information about each module.