Are JVM's platform independent ? How it is different from JDK ?

JVM is Java Virtual Machine which is a run time environment for the compiled java class files.

JVM's are not platform independent. JVM's are platform specific run time implementation provided by the vendor.

JDK is Java Development Kit which is for development purpose and it includes execution environment also.

But JVM is purely a run time environment and hence you will not be able to compile your source files using a JVM.