Question: 1. Explain how a class dependency graph differs from a UML class diagram. 2. Suppose that you have two classes: class A that is responsible

1. Explain how a class dependency graph differs from a UML class diagram. 2. Suppose that you have two classes: class A that is responsible for reading an address provided by user and its supplier class b that verify whether a user-provided post code is located within the user-provided state. Write the contract between classes A and B. 3. Why does each contract have to specify preconditions?

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