An alternative for the Java Maps that can be easly used and extended

OtherMap is available at JitPack's Maven repo.

If you're using Gradle, you could add OtherMap as a dependency with the following steps:

1. Add maven { url 'https://jitpack.io' } to the repositories in your build.gradle.
2. Add compile 'com.github.FlorianSteenbuck:OtherMap:dev-SNAPSHOT'the dependencies in your build.gradle. Replace dev-SNAPSHOT with the latest release.