A class loader is an object that is responsible for loading classes. The class ClassLoader is an abstract class. Given the binary name of a class, a class loader should attempt to locate or generate data that constitutes a definition for the class. A typical strategy is to transform the name into a file name and then read a class file of that name from a file system.
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Classes A, B, and C all have different default network masks, and it's that mask that tells you which part of an address is the network portion and which part is the host portion. Class A's default mask is 255.0.0.0, or /8. Class B's default mask is 255.255.0.0, or /16.