A Android Source Code -> https://cs.android.com B Bash Shell -> https://www.gnu.org/software/bash/manual/bash.html C C++ -> https://en.cppreference.com D Dart -> https://api.dart.dev/stable F Flutter -> https://flutter.cn J Java -> https://docs.oracle.com/javase/8/docs/api Javascript -> https://developer.mozilla.org/en-US/docs/Web/JavaScript JNI -> https://docs.oracle.com/javase/8/docs/technotes/guides/jni/spec/jniTOC.html JVM -> https://docs.oracle.com/javase/specs/jvms/se8/html/index.html K Kotlin -> https://kotlinlang.org/api/latest/jvm/stdlib O OpenJDK -> https://hg.openjdk.java.net/jdk8/jdk8/jdk/file/687fd7c7986d/src/share/classes/java P Python -> https://docs.python.org/3/c-api/index.html