Generics in java

 Generics in java

Generics are a feature in Java that allow developers to create classes and methods that can work with different types of data. Here is an example of how to use generics in Java:

import java.util.ArrayList;

import java.util.List;

public class Main {

  public static void main(String[] args) {

    List<String> strings = new ArrayList<>();

    strings.add("apple");

    strings.add("banana");

    strings.add("orange");

    List<Integer> integers = new ArrayList<>();

    integers.add(1);

    integers.add(2);

    integers.add(3);

    printList(strings);

    printList(integers);

  }

  public static <T> void printList(List<T> list) {

    for (T item : list) {

      System.out.println(item);

    }

  }

}

In this example, we define two different lists - one that contains strings and one that contains integers. We then call a printList method twice, passing each list as an argument. The printList method is defined with a generic type parameter T. This allows the method to work with any type of list. The method uses a for loop to iterate over the list and print each item to the console.