java-判断某个数据是否在某个数组中

        Integer[] arr = {1,2,3};
        int a = 2;
        System.out.println(Arrays.asList(arr).contains(a));

第二种方案：采用定义list方案

        ArrayList<Integer> channelArray = new ArrayList<>();
        channelArray.add(1);
        channelArray.add(2);
        channelArray.add(3);
        System.out.println(channelArray.contains(5));

直接创建map对性能不太友好，采用静态map方式

private final static Map<Integer, String> channelMap = new HashMap<>();

    static {
        channelMap.put(1, "站内信");
        channelMap.put(2, "push");
        channelMap.put(3, "短信模板");
    }