What's the Difference Between `int` and `Integer` in Java and C#?

In-depth understanding of int and Integer in Java and C#

In Java and C#, int and Integer are commonly used data types, but there are subtle differences between the two that affect their behavior in different languages.

Java

In Java, int is a basic data type that directly stores integer values ​​and does not contain any object references. And Integer is a wrapper class that represents int values ​​as objects.

C#

In C#, int is equivalent to System.Int32. It is a value type, similar to Java's int. integer is a keyword representing the Integer structure. Like other value types, integer can be boxed as an object.

Key differences

The main difference between primitive types and objects is their behavior:

• Polymorphism: Objects support polymorphism, allowing them to exhibit different behaviors depending on their type. Primitive types do not support polymorphism.
• Parameter passing mechanism: Objects are passed by reference, while basic types are passed by value.
• Memory Allocation: Objects are allocated from the heap, while primitive types are usually allocated from the stack.

Summary

Understanding the difference between int and Integer in Java and C# is crucial to ensuring that your program executes correctly. int is more efficient and is used for basic integer operations; while Integer provides additional object-oriented features such as polymorphism and flexibility.

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