Question: java When a concrete class implements an interface, it must 1.write complete methods for all the methods in the interface 2.concrete classes cannot implement interfaces

java

When a concrete class implements an interface, it must

1.write complete methods for all the methods in the interface

2.concrete classes cannot implement interfaces - only abstract classes can
3.

not have a constructor since it is inherited from the interface

4.write abstract methods with the exact signature as in the interface

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