Java pre-installed in Windows and Linux?

Question

我知道Java已预装在Mac OS X中，但我想知道它是否已预装在Windows XP，Vista，7和所有Linux发行版中吗？

Answer 1

Java isn't preinstalled in any Windows version (OEM not included - depends on the manufacturer then).

I think it is not common in Linux distributions at all, but I don't want to make a general statement about ALL distros here ;-)

Answer 2

Fedora Linux附带了开源Java IcedTea 。

Answer 3

Some Linux versions I experienced comes with old versions of Java JDK (so you must take care developing for these distributions!) or with an alternative version of the compiler: Gnu Compiler Java (GCJ).

About the virtual machine, I've just seen the JVM in Windows and Linux, provided by Sun.

Answer 4

I understand that the vast majority of PCs come with the Sun JRE installed. There was a bit of a law suite between Microsoft and Sun (my employer, now a wholly owned subsidiary of Oracle).

The "6-open" OpenJDK is a backport of the GPLed JDK7. General purpose distros should include it, but of course with Linux you are fighting with package management.