JavaCard OS

Does each javacard applet correspond to one JCVM instance? As we all know, each java program have one JVM instance. Is this same with JCVM?

- If not, it can show that there is only one JCVM and one JCRE as well. If that is the case, how does the applets work in one JCVM ?

There is only one JCVM, and one JCRE as well.

Each applet exists inside this single JCVM and there is an applet firewall to isolate each applet.

For more information regarding Applet firewall, see Java Card 3 Platform Runtime Environment Specification, Classic Edition -> 6 Applet Isolation and Object Sharing -> 6.1 Applet Firewall