Int vs Integer in Java

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In Java, both int and Integer are used to represent integer values, but there are some important differences between them.

int is a primitive data type in Java, which means it is a basic type that is built into the language. It represents a 32-bit signed integer value and can hold values from -2^31 to 2^31-1. Because int is a primitive type, it is faster and takes less memory than the Integer object.

On the other hand, Integer is a wrapper class that provides functionality to convert an int to an object and vice versa. Integer objects are used when an object reference is required, such as when working with collections or when passing integers to methods that require objects.

One advantage of using Integer over int is that it provides additional methods and constants for working with integers, such as parseInt() for converting a string to an integer and MAX_VALUE and MIN_VALUE for getting the maximum and minimum integer values.

Another important difference between int and Integer is that int is a primitive type, so it cannot be null. In contrast, Integer is an object, so it can be null. This can be useful in situations where you need to represent the absence of a value.

In general, you should use int when you need to represent an integer value and don’t need the additional functionality provided by Integer, and use Integer when you need to work with objects, collections, or when you need to take advantage of the additional methods and constants provided by the class.

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