哪个 JVM 用于 Raspberry Pi

Question

I'm a little bit confused about the various ways to run Java programs on the Raspberry Pi. As I see it there are the following possibilities:

Java 6:

• Java SE 6 Embedded

Java 7:

• OpenJDK 7
• Java SE 7 Embedded
• JDK 7.40 (and greater)

Java 8:

• JDK 8

This brings us to the following questions:

1. Is there a difference between the JVM shipped with JDK and Java SE?
2. Is there no ARM version of OpenJDK 6 or 8?
3. What are the benefits of Java SE 7 Embedded over the regular Java SE 7 VM (included in JDK 7)? I could only find the following points:
   • Low memory footprint
   • No AWT/Swing
4. Java SE 7.40 for Raspberry Pi The Oracle homepage only lists downloads for an ARM v6/v7 Soft Float ABI and an v7 Hard Float ABI version. As the Raspberry Pi uses the v6 architecture I guess you have to use the Soft Float version. So there should be no speed improvements over the Java SE 7 Embedded VM which also uses the Soft Float ABI, right?
5. Is there no embedded version of Java SE 8?
6. Does JDK 8 always use the Hard Float ABI or is there also a Soft Float ABI version?

To sum up:

• If you want to use the Hard Float ABI use the developer preview of JDK 8
• If you want a stable Java version with a low memory footprint use Java SE 7 Embedded
• If you want a stable Java version and want to use Swing/Awt use JDK 7.40 (and greater)

Answer 1

自 9 月以来，所有 Raspbian 映像都将（默认）随 Oracle Java 一起提供，该 Java 应该针对 Raspberry 进行优化