java - 为什么我收到此错误？ （UIManager无法应用）

Question

我收到的错误是...... “put（Object，Object）在UIManager中无法应用于（int）”

    Random rand = new Random();

    int randomNum = rand.nextInt(7)+1;

    Map <String, Integer> colours = new HashMap<>(); {{
       put("red",1);
       put("white",2);
       put("purple",3);
       put("orange",4);
       put("pink",5);
       put("yellow",6);
       put("green",7);
       put("blue",8);
    }};

    Map <String, Integer> answer = new HashMap<>(); {{
        put(randomNum);
        put(randomNum);
        put(randomNum);
        put(randomNum);
    }};

我正在尝试设置一个充满颜色的地图，然后将4种随机颜色应用于新地图。它会允许任何颜色等粉红色粉红色粉红色，红色黄色白色白色......我在哪里出错？

Answer 1

我认为你的设计并不正确。也许你应该这样做：

    Random rand = new Random();

    Map<Integer, String> colours = new HashMap<>();
    colours.put(1, "red");
    colours.put(2, "white");
    colours.put(3, "purple");
    colours.put(4, "orange");
    colours.put(5, "pink");
    colours.put(6, "yellow");
    colours.put(7, "green");
    colours.put(8, "blue");

    List<String> answer = new ArrayList<String>();
    answer.add(colours.get(rand.nextInt(7) + 1));
    answer.add(colours.get(rand.nextInt(7) + 1));
    answer.add(colours.get(rand.nextInt(7) + 1));
    answer.add(colours.get(rand.nextInt(7) + 1));

Answer 2

您只放置整数，必须使用<String, Integer>地图格式：

等参考

Map <String, Integer> answer = new HashMap<>();   {{
         put(randomNum);
         put(randomNum);
         put(randomNum);
         put(randomNum); 
}};

尝试这样：

Random rand = new Random();

Map <String, Integer> colours = new HashMap<>();
colours.put("red", 1);
colours.put("white", 2);
colours.put("purple", 3);
colours.put("orange", 4);
colours.put("pink", 5);
colours.put("yellow", 6);
colours.put("green", 7);
colours.put("blue", 8);

//creating a Set variable for colours keySet
Set<String> keySet = colours.keySet();

//creating a list variable for getting the key by putting value
ArrayList<String> keyList = new ArrayList<String>(keySet);

Map <String, Integer> answer = new HashMap<>();

int randomNum = rand.nextInt(7)+1;
for(int i = 1; i <= 8; i++){

    //creating a random number between 1 to 7
    randomNum = rand.nextInt(7)+1;

    //first getting the key by value and putting in map as key
    answer.put(keyList.get(randomNum), randomNum);

    //showing the mapped value as key color name 
    System.out.println(answer.get(keyList.get(randomNum)));
}

请在那里添加一个String对象作为键，以删除错误。