将两个while循环代码转换为java 8流代码

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

public class Main {
    public static void main(String[] args) {
        // 示例数据
        List<Integer> numbers = new ArrayList<>();
        numbers.add(1);
        numbers.add(2);
        numbers.add(3);
        numbers.add(4);
        numbers.add(5);

        // 第一个while循环代码转换为流代码
        List<Integer> filteredNumbers = new ArrayList<>();
        int i = 0;
        while (i < numbers.size()) {
            if (numbers.get(i) % 2 == 0) {
                filteredNumbers.add(numbers.get(i));
            }
            i++;
        }
        System.out.println(filteredNumbers);

        List<Integer> filteredNumbersStream = numbers.stream()
                .filter(num -> num % 2 == 0)
                .collect(Collectors.toList());
        System.out.println(filteredNumbersStream);

        // 第二个while循环代码转换为流代码
        List<Integer> doubledNumbers = new ArrayList<>();
        int j = 0;
        while (j < filteredNumbers.size()) {
            doubledNumbers.add(filteredNumbers.get(j) * 2);
            j++;
        }
        System.out.println(doubledNumbers);

        List<Integer> doubledNumbersStream = filteredNumbers.stream()
                .map(num -> num * 2)
                .collect(Collectors.toList());
        System.out.println(doubledNumbersStream);
    }
}