使用流从元组列表生成列表元组

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

public class TupleListToTupleList {
    public static void main(String[] args) {
        List<Tuple> tupleList = List.of(
                new Tuple("A", 1),
                new Tuple("B", 2),
                new Tuple("C", 3)
        );

        List<Tuple> resultList = tupleList.stream()
                .map(tuple -> new Tuple(tuple.getKey().toUpperCase(), tuple.getValue() * 2))
                .collect(Collectors.toList());

        System.out.println(resultList);
    }

    static class Tuple {
        private String key;
        private int value;

        public Tuple(String key, int value) {
            this.key = key;
            this.value = value;
        }

        public String getKey() {
            return key;
        }

        public int getValue() {
            return value;
        }

        @Override
        public String toString() {
            return "(" + key + ", " + value + ")";
        }
    }
}