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Java Inner Class
In java Inner class or nested class is declared inside the class or interface. We use inner class because it increases more readable & maintainable of code.
Generate random numbers in Java
There are two principal means of generating random (really pseudo-random) numbers: one is using the Random class and the other is using the Math.random method.
Encapsulation
The whole idea behind encapsulation is to hide the implementation details from users. If a data member is private it means it can only be accessed within the same class. No outside class can access private data member (variable) of other class.