List <T>如何在内部映射？

import java.util.List;
import java.util.stream.Collectors;

public class ListMappingExample {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
        List<Integer> squares = numbers.stream()
                                        .map(number -> number * number)
                                        .collect(Collectors.toList());
        System.out.println(squares); // 输出 [1, 4, 9, 16, 25]
    }
}

import java.util.List;

public class ListMappingExample {
    public static void main(String[] args) {
        List<Integer> numbers = Arrays.asList(1, 2, 3, 4, 5);
        List<Integer> squares = new ArrayList<>();
        for (Integer number : numbers) {
            squares.add(number * number);
        }
        System.out.println(squares); // 输出 [1, 4, 9, 16, 25]
    }
}