java - 如何计算数组的输入

Question

我正在处理的这个数组遇到了问题。在 for 循环中，我需要以某种方式计算基础百分比。索引 0 处的元素将存储 OBP。如何保留用户输入的用于计算 OBP 的信息？谢谢。

     for (int index = 0; index < years.length; index++)
     {
       System.out.print("For Year " + (index +1 ) + "\nEnter number of hits: ");
       years[index] = keyboard.nextInt();

       System.out.print("For Year " + (index +1) + "\nEnter number of walks: ");
       years[index] = keyboard.nextInt();

       System.out.print("For Year" + (index +1) + "\nEnter the number of times player"
                          + "has been hit by a pitch:");
       years[index] = keyboard.nextInt();

       System.out.print("For Year" + (index +1) + "\nEnter the number of at bats:");
       years[index] = keyboard.nextInt();

       System.out.print("For Year" + (index +1) + "\nEnter the number of sacrafice flies" 
                          + "that year: ");
       years[index] = keyboard.nextInt();

     }

Answer 1

对于此用例，我建议在 HashMap 中使用 HashMap。

循环之前:

HashMap<Integer, HashMap<String, Integer>> years = new HashMap<>();
HashMap<String, Integer> entry = new HashMap<>();

对于用户键盘的每个输入(示例):

entry.put("hits", 5);
years.put(2019, entry);

entry.put("walks", 10);
years.put(2019, entry);

最终你会得到如下结果:

{2019={hits=5, walks=10}}

检索结果也很简单:

// retrieve map of data for a specific year:
years.get(2019)

result: {hits=5, walks=10}

// retrieve specific data for a specific year:
years.get(2019).get("hits")

result: 5