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Questions and Answers
What is a wrapper class?
What is a wrapper class?
- A class used for string manipulation
- A class that only works with integers
- A class that provides constants and methods for working with primitive types (correct)
- A class that cannot be changed
What does the Integer wrapper class do?
What does the Integer wrapper class do?
It wraps a value of the primitive type int in an object.
What does the Double wrapper class do?
What does the Double wrapper class do?
It wraps a value of the primitive type double in an object.
What is a class constant?
What is a class constant?
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What is Integer.MIN_VALUE?
What is Integer.MIN_VALUE?
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What is Integer.MAX_VALUE?
What is Integer.MAX_VALUE?
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What does the intValue() method do?
What does the intValue() method do?
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What is underflow?
What is underflow?
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What is overflow?
What is overflow?
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What is autoboxing?
What is autoboxing?
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What is unboxing?
What is unboxing?
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Study Notes
Wrapper Classes Overview
- Wrapper classes are found in the
java.langpackage and facilitate working with primitive types by providing constants and methods.
Integer Wrapper Class
- The
Integerclass encapsulates the primitive typeint, allowing it to be treated as an object. - Contains a single
intfield, enabling object-oriented functionalities.
Double Wrapper Class
- The
Doubleclass encapsulates the primitive typedouble, allowing it to be treated as an object. - Contains a single
doublefield, enabling object-oriented functionalities similar to theIntegerclass.
Class Constants
- Constants are immutable values defined at the class level and can be accessed throughout the class without modification.
Integer Constants
Integer.MIN_VALUE: Represents the smallest integer value, which is -2^31.Integer.MAX_VALUE: Represents the largest integer value, which is 2^31 - 1.
Integer Methods
intValue(): Method that retrieves theintvalue from anIntegerobject.
Underflow and Overflow
- Underflow occurs when calculations produce a result that is too small for the available bit representation.
- Overflow occurs when calculations result in a value too large for the bit representation, akin to a car's odometer exceeding its limit.
Autoboxing and Unboxing
- Autoboxing refers to the automatic conversion process between primitive types and their corresponding wrapper class types.
- Unboxing is the process of converting a wrapped object back into its corresponding primitive type.
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