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What are the differences between `Integer.parseInt()` and the `Integer` constructor?
`Integer.parseInt()` parses a String to an int. The `Integer` constructor creates an `Integer` object from an int or String.
What are the differences between `Double.parseDouble()` and the `Double` constructor?
`Double.parseDouble()` parses a String to a double. The `Double` constructor creates a `Double` object from a double or String.
How are wrapper classes used in data validation?
Wrapper classes can be used to represent nullable values in databases, which can be useful when a field is not required.
How are wrapper classes used in generic data structures?
Generic data structures like `ArrayList<Integer>` require objects, so wrapper classes are used to store primitive data.
What is a wrapper class?
A class that encapsulates a primitive data type, allowing it to be treated as an object.
What is the Integer class?
A wrapper class for the primitive type `int`.
What is the Double class?
A wrapper class for the primitive type `double`.
What is autoboxing?
The automatic conversion of a primitive type to its corresponding wrapper class object.
What is unboxing?
The automatic conversion of a wrapper class object to its corresponding primitive type.