将当前索引映射为键的Java Streams列表

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

public class Main {
    public static void main(String[] args) {
        List<String> elements = List.of("apple", "banana", "orange");

        List<KeyValue<Integer, String>> indexedList = IntStream.range(0, elements.size())
                .mapToObj(i -> new KeyValue<>(i, elements.get(i)))
                .collect(Collectors.toList());

        // 输出列表中的键值对
        for (KeyValue<Integer, String> keyValue : indexedList) {
            System.out.println("Key: " + keyValue.getKey() + ", Value: " + keyValue.getValue());
        }
    }
}

class KeyValue<K, V> {
    private final K key;
    private final V value;

    public KeyValue(K key, V value) {
        this.key = key;
        this.value = value;
    }

    public K getKey() {
        return key;
    }

    public V getValue() {
        return value;
    }
}