Question: Q. No. 2. Explain an invariant method. The invariant() method must be declared protected and non-static. Explain how interfaces have contracts. Clarify how Contracts from

Q. No. 2. Explain an invariant method. The invariant() method must

Q. No. 2. Explain an invariant method. The invariant() method must be declared protected and non-static. Explain how interfaces have contracts. Clarify how Contracts from interfaces are logically or-ed with the superclass and subclass contracts in the case of preconditions. Explain how interfaces have contracts

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