The Java Stream map() method is an intermediate operation.

Java Stream map() Example

The Java Stream map() method converts (maps) an element to another object. For instance, if you had a list of strings it could convert each string to lowercase, uppercase, or to a substring of the original string, or something completely else.

Here is a Java Stream map() example: If you have a List of String and you want to convert that to a List of Integer, you can use map() to do so.

import java.util.Arrays;
import java.util.List;
import java.util.stream.Collectors;
 
public class Main 
{
    public static void main(String[] args) 
    {
        List<String> listOfStrings = Arrays.asList("1", "2", "3", "4", "5");
         
        List<Integer> listOfIntegers = listOfStrings.stream()
                        .map(Integer::valueOf)
                        .collect(Collectors.toList());
         
        System.out.println(listOfIntegers);
    }
}