How to define generic methods in Java functions?

Generic method definition: Specify type parameters () before the method name to achieve common operations across multiple data types. Practical case: The printList method takes the generic to accept lists of different types as parameters and prints elements one by one without creating a separate method for each type.

Definition of generic methods in Java functions

##Generic methodsallow us to Use type parameters to create generic methods that can work on multiple data types.

Define a generic method

To define a generic method, place the generic type parameter list in front of the method name and enclose it in parentheses. Parentheses enclose it. For example:

public <T> void printElement(T element) {
    // 方法体
}

In this method,

is a type parameter, which means that the method can accept and operate elements of any type T.

Practical Case

Consider the following scenario where each element in a list of different types needs to be printed:

Code Example

public static <T> void printList(List<T> list) {
    for (T element : list) {
        System.out.println(element);
    }
}

public static void main(String[] args) {
    List<String> stringList = List.of("Hello", "World");
    List<Integer> integerList = List.of(1, 2, 3);

    printList(stringList);
    printList(integerList);
}

Output

Hello
World
1
2
3

In this example, the

printList method is generic because it accepts type parameters. This makes it possible to print a list of elements of any type without having to create separate methods for each type.

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