java - 如何在具有不同键的外部 hashMap 中传递具有相同键的内部 hashMap？

Question

public static HashMap<String, HashMap<String,Object>> getDataDictionary() {
    // Virtual Data Creation - Simulating The 9 Fields HAR value
    HashMap<String,Object> valueFromEachOfThoseNineFields = new HashMap<String,Object>();
    HashMap<String, HashMap<String,Object>> fileNameConstrains = new HashMap<String,HashMap<String,Object>>();
    valueFromEachOfThoseNineFields.put("A", 10);
    valueFromEachOfThoseNineFields.put("B", 20);
    valueFromEachOfThoseNineFields.put("C", 30);
    valueFromEachOfThoseNineFields.put("D", 10);
    valueFromEachOfThoseNineFields.put("E", 5);
    valueFromEachOfThoseNineFields.put("F", 20);
    valueFromEachOfThoseNineFields.put("G", 1);
    valueFromEachOfThoseNineFields.put("H", 100);
    valueFromEachOfThoseNineFields.put("I", 66);
    fileNameConstrains.put("File1", valueFromEachOfThoseNineFields);
    valueFromEachOfThoseNineFields.put("A", 10);
    valueFromEachOfThoseNineFields.put("B", 50);
    valueFromEachOfThoseNineFields.put("C", 30);
    valueFromEachOfThoseNineFields.put("D", 90);
    valueFromEachOfThoseNineFields.put("E", 5);
    valueFromEachOfThoseNineFields.put("F", 20);
    valueFromEachOfThoseNineFields.put("G", 10);
    valueFromEachOfThoseNineFields.put("H", 90);
    valueFromEachOfThoseNineFields.put("I", 61);
    fileNameConstrains.put("File2", valueFromEachOfThoseNineFields);
    valueFromEachOfThoseNineFields.put("A", 10);
    valueFromEachOfThoseNineFields.put("B", 60);
    valueFromEachOfThoseNineFields.put("C", 30);
    valueFromEachOfThoseNineFields.put("D", 2);
    valueFromEachOfThoseNineFields.put("E", 13);
    valueFromEachOfThoseNineFields.put("F", 9);
    valueFromEachOfThoseNineFields.put("G", 15);
    valueFromEachOfThoseNineFields.put("H", 88);
    valueFromEachOfThoseNineFields.put("I", 69);
    fileNameConstrains.put("File3", valueFromEachOfThoseNineFields);

    return fileNameConstrains;
}

在这种情况下，我只得到最后一组，所有数据都被覆盖，任何人都可以帮助我弄清楚如何以如下格式传递数据？

{Key="File1", value={'a'=10,'b'=5}}

等等。

Answer 1

每次您想要将值存储到其中时，都需要将新的 HashMap 实例分配给 valueFromEachOfThoseNineFields ，然后将 valueFromEachOfThoseNineFields 存储到 >fileNameConstrains 如下:

import java.util.HashMap;

public class Main {

    public static void main(String[] args) {
        System.out.println(getDataDictionary());
    }

    public static HashMap<String, HashMap<String, Object>> getDataDictionary() {
        // Virtual Data Creation - Simulating The 9 Fields HAR value
        HashMap<String, Object> valueFromEachOfThoseNineFields;
        HashMap<String, HashMap<String, Object>> fileNameConstrains = new HashMap<String, HashMap<String, Object>>();

        valueFromEachOfThoseNineFields = new HashMap<String, Object>();
        valueFromEachOfThoseNineFields.put("A", 10);
        valueFromEachOfThoseNineFields.put("B", 20);
        valueFromEachOfThoseNineFields.put("C", 30);
        valueFromEachOfThoseNineFields.put("D", 10);
        valueFromEachOfThoseNineFields.put("E", 5);
        valueFromEachOfThoseNineFields.put("F", 20);
        valueFromEachOfThoseNineFields.put("G", 1);
        valueFromEachOfThoseNineFields.put("H", 100);
        valueFromEachOfThoseNineFields.put("I", 66);
        fileNameConstrains.put("File1", valueFromEachOfThoseNineFields);

        valueFromEachOfThoseNineFields = new HashMap<String, Object>();
        valueFromEachOfThoseNineFields.put("A", 10);
        valueFromEachOfThoseNineFields.put("B", 50);
        valueFromEachOfThoseNineFields.put("C", 30);
        valueFromEachOfThoseNineFields.put("D", 90);
        valueFromEachOfThoseNineFields.put("E", 5);
        valueFromEachOfThoseNineFields.put("F", 20);
        valueFromEachOfThoseNineFields.put("G", 10);
        valueFromEachOfThoseNineFields.put("H", 90);
        valueFromEachOfThoseNineFields.put("I", 61);
        fileNameConstrains.put("File2", valueFromEachOfThoseNineFields);

        valueFromEachOfThoseNineFields = new HashMap<String, Object>();
        valueFromEachOfThoseNineFields.put("A", 10);
        valueFromEachOfThoseNineFields.put("B", 60);
        valueFromEachOfThoseNineFields.put("C", 30);
        valueFromEachOfThoseNineFields.put("D", 2);
        valueFromEachOfThoseNineFields.put("E", 13);
        valueFromEachOfThoseNineFields.put("F", 9);
        valueFromEachOfThoseNineFields.put("G", 15);
        valueFromEachOfThoseNineFields.put("H", 88);
        valueFromEachOfThoseNineFields.put("I", 69);
        fileNameConstrains.put("File3", valueFromEachOfThoseNineFields);

        return fileNameConstrains;
    }
}

输出:

{File3={A=10, B=60, C=30, D=2, E=13, F=9, G=15, H=88, I=69}, File2={A=10, B=50, C=30, D=90, E=5, F=20, G=10, H=90, I=61}, File1={A=10, B=20, C=30, D=10, E=5, F=20, G=1, H=100, I=66}}