java - java中将对象列表转换为键值对

Question

我有 java 对象列表[["X","10"],["y","20"],["Z","30"]]

如何将其转换为键值对？我希望它是

键:值X:10y:20Z:30

谢谢

Answer 1

您可以使用“java.util.stream.Collectors”来实现此目的。请引用下面的例子

    public class KeyValue {

            private String key;
            private int value;

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

            public String getKey() {
                return key;
            }

            public int getValue() {
                return value;
            }
    }

将列表转换为 map

    List <KeyValue> list = new ArrayList<>();

    list.add(new KeyValue("X", 10));
    list.add(new KeyValue("Y", 20));
    list.add(new KeyValue("Z", 30));


    Map<String, Integer> map = list.stream().collect(
            Collectors.toMap(kv -> kv.getKey(), kv -> kv.getValue()));