Hierarchical Relationship Between Method Calls
As you know, a method is invoked by a method call, and when the called method completes its task, it returns control and possibly a result to the caller. An analogy to this program structure is the hierarchical form of management (Fig. 6.1). A boss (the caller) asks a worker (the called method) to perform a task and report back (return) the results after completing the task. The boss method does not know how the worker method performs its designated tasks. The worker may also call other worker methods, unbeknown to the boss. This “hiding” of implementation details promotes good software engineering. Figure 6.1 shows the boss method communicating with several worker methods in a hierarchical manner. ...
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