What is type parameterization in Java?

Type parameterization in Java

Type parameterization in Java refers to the process of parameterizing classes, interfaces, or methods with type parameters, also known as generics. It allows these constructs to operate on different types without specifying the actual type until the code is used. Parameterization enables developers to create reusable and type-safe code by abstracting over types.

 type parameterization

Explanation

1. Generic Types: Type parameterization allows you to define generic types by declaring one or more type parameters within angle brackets (<>). These type parameters act as placeholders for actual types that are provided when using the generic type.

2. Flexibility and Reusability: Type parameterization promotes code flexibility and reusability by enabling classes, interfaces, and methods to work with any data type. This eliminates the need for writing duplicate code for each specific type and encourages the creation of generic algorithms and data structures.

3. Type Safety: Type parameterization provides type safety by enforcing type constraints at compile time. This ensures that type-related errors are caught during compilation rather than at runtime, leading to more robust and reliable code.

Example

java
import java.util.ArrayList;
import java.util.List;

public class TypeParameterizationExample {
    public static void main(String[] args) {
        // Parameterized type: List<String>
        List<String> stringList = new ArrayList<>();

        // Add elements to the List
        stringList.add("Java");
        stringList.add("Python");
        stringList.add("C++");

        // Iterate over the List and print each element
        for (String str : stringList) {
            System.out.println(str);
        }
    }
}

In this example, List is a parameterized type where String is the type parameter. The List interface is parameterized with the type String, indicating that the list can only contain strings. This allows the stringList variable to hold a list of strings, and the compiler ensures that only string elements are added to the list. Type parameterization enhances type safety and facilitates the creation of reusable code that can work with different types.

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