BTreeMap

Also, check out BPlusTreeMap, which also rupports range queries. https://github.com/huntj88/BPlusTreeMap

Usage Querying for six values out of 10 million

Name		Name	Last commit message	Last commit date
Latest commit History 19 Commits
gradle/wrapper		gradle/wrapper
img		img
src		src
.gitignore		.gitignore
README.MD		README.MD
build.gradle		build.gradle
gradle.properties		gradle.properties
gradlew		gradlew
gradlew.bat		gradlew.bat
local.properties		local.properties
settings.gradle		settings.gradle

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