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Java Forum / General / March 2008what the java virtual machine truely is?
Q: Can the java code run without java virtual machine ? When we instal the jdk, does the java virtual machine setup at the same time? What is the relationship between the fold jre and java virtual machine ? > Q: Can the java [sic] code run without java virtual machine ? Normally, no, but there are some compilers like GCJ (Gnu Compiler for J*va) that can run some Java code without a JVM. > When we instal the jdk [sic], does the java virtual machine setup at the same > time? It installs at the same time, in the form of the "java" command (java.exe on Windows), so I guess you could say its set up at the same time. There wouldn't be much point to the JDK without the JVM, after all. But simply installing the JDK doesn't *run* the JVM. That happens when you (directly or indirectly) invoke the 'java' command. > What is the relationship between the fold jre and java virtual machine ? What do you mean by the "fold" JRE? The JRE comprises the Java Virtual Machine and the rest of the Java Runtime Environment, including various bootstrap JARs and other components. Java, the programming language, is spelled with a capital "J".  SignatureLew >> Q: Can the java [sic] code run without java virtual machine ? > [quoted text clipped - 17 lines] > > What do you mean by the "fold" JRE? I'm guessing it's a typo for "full" (possibly assisted by a spell-checker that converted, say, "fuld" to "fold"). > The JRE comprises the Java Virtual Machine and the rest of the Java > Runtime Environment, including various bootstrap JARs and other > components. > Java, the programming language, is spelled with a capital "J". > >> What is the relationship between the fold jre and java virtual > >> machine ? [quoted text clipped - 3 lines] > I'm guessing it's a typo for "full" (possibly assisted by a > spell-checker that converted, say, "fuld" to "fold"). I thought he meant "folder". Either of the possibilties make sense to me :p SignatureSabine Dinis Blochberger Op3racional www.op3racional.eu >> When we instal the jdk [sic], does the java virtual machine setup at >> the same [quoted text clipped - 3 lines] > (java.exe on Windows), so I guess you could say its set up at the same > time. There wouldn't be much point to the JDK without the JVM, after all. Especially not since much (possible most) of the functionality in JDK is implemented in Java (tools.jar). Arne On Wed, 5 Mar 2008 20:56:38 -0800 (PST), 525 <xuemingzhang525@gmail.com> wrote, quoted or indirectly quoted someone who said : >Q: Can the java code run without java virtual machine ? That's a matter of semantics. It is possible to compile to native code. The vm is there only in the vaguest sense. see http://mindprod.com/jgloss/nativecompiler.html >When we >instal the jdk, does the java virtual machine setup at the same >time? The vm only exists while Java.exe is running. >What is the relationship between the fold jre and java >virtual machine ? When the JRE java.exe is running it is simulating the Java virtual machine. In other words, it makes your computer pretend to be an ideal Java computer that can run class files directly. -- Roedy Green Canadian Mind Products The Java Glossary http://mindprod.com Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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