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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 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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