How to set default parameter in java

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  Add an instance variable of type Safe to the class Room. This instance variable should be initialised in the constructor of Room, and an appropriate query should be defined to get it.

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  Design a class ‘complex ‘with data members for real and imaginary part. provide default and parameterized constructors. write a program to perform arithmetic operations of two complex numbers.

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  Get random String from array list

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