Applets loaded over the net are loaded by the applet class loader. For
example, the applet viewer?s applet class loader is implemented by the class
sun.applet.AppletClassLoader.The class loader enforces the Java name space hierarchy. The class loader guarantees that a unique namespace exists for classes that come from the local file system, and that a unique namespace exists for each network source. When a browser loads an applet over the net, that applet?s classes are placed in a private namespace associated with the applet?s origin. Thus, applets loaded from different network sources are partitioned from each other. Also, classes loaded by the class loader are passed through the verifier. The verifier checks that the class file conforms to the Java language specification ? it doesn?t assume that the class file was produced by a ?friendly? or ?trusted? compiler. On the contrary, it checks the class files for purposeful violations of the language type rules and name space restrictions. The verifier ensures that:
a. There are no stack overflows or underflows.
b. All register accesses and stores are valid.
c. The parameters to all byte code instructions are correct.
d. There is no illegal data conversion.
e. The verifier accomplishes that by doing a data-flow analysis of the byte code instruction stream, along with checking the class file format, object signatures, and special analysis of finally clauses that are used for Java exception handling.

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