java - 如何从 LinkedHashMap 获取 key

Question

如何从LinkedHashMap获取key？

例如，我有 LinkedHashMap，其中包含键和用户名，我需要在扫描仪的帮助下输入名称，然后我想查看该元素具有什么键，即我输入的元素:

static LinkedHashMap<Integer, String> names = new LinkedHashMap<>();
static Scanner sc = new Scanner(System.in);
static int i = 1;
stasic String name;

public static void main(String[] args) {
    int b = 0;
    while (b == 0) {
        System.out.println("Input your name: ");
        name = sc.nextLine;
        names.put(i, name);
        i += 1;
        outName();
    }
}

public static void outName() {
    System.out.println("Input name: ");
    name = sc.nextLine();
    if (names.containsValue(name)) {
        //I do not know what should I do here?
    }
}

Answer 1

for (Map.Entry<String, ArrayList<String>> entry : names.entrySet()) {
String key = entry.getKey();
ArrayList<String> value = entry.getValue();
}

使用Map.Entry进行迭代