What is Autoboxing and Unboxing?
Autoboxing and unboxing are processes in Java that automatically convert primitive data types to their corresponding wrapper classes and vice versa.
Autoboxing: When a primitive data type is assigned to a wrapper class, Java automatically converts the primitive value into an instance of the wrapper class. For example, when the following code is executed:
java
Integer i = 10;
The primitive value 10 is autoboxed into an instance of the Integer class, which is stored in the variable i.
Unboxing: When a wrapper class is assigned to a primitive data type, Java automatically converts the wrapper class instance into the corresponding primitive value. For example, when the following code is executed:
java
int j = i;
The Integer instance stored in the variable i is unboxed into the primitive value 10, which is stored in the variable j.
Autoboxing and unboxing are useful for improving the readability and maintainability of Java code, as they eliminate the need for explicit conversions between primitive data types and wrapper classes. However, they can also lead to performance issues if used excessively, as each autoboxing or unboxing operation involves the creation or destruction of an object.
Related Questions
- What is the difference between a primitive data type and a wrapper class?
- When should autoboxing and unboxing be used?
- What is the performance impact of autoboxing and unboxing?
- Can autoboxing and unboxing be disabled?
- What are the alternatives to autoboxing and unboxing?
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