Question: java how do I add this to my code? Add a zero-parameter constructor to the AirRoutes class, which initialises routes to a new instance of

java how do I add this to my code?

Add a zero-parameter constructor to the AirRoutes class, which initialises routes to a new instance of HashMap. The reader field should be initialised to a new instance of InputReader, using the constructor in the InputReader class. Finally, the method populateRoutes should be invoked.

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