java - 循环将值输入到 Java Hashmap 中

Question

我正在尝试将值插入到 HashMap 中。当从字符串列表中检索值时，我将其置于循环中。代码如下:

HashMap<String, String> resultHashMap = new HashMap<String, String>();

//add the top document id back to the resultHashMap
resultHashMap.put("entryObject", dsStepParam.getValue());

for(String res : results) 
{
    log.info(res);
    resultHashMap.put("dataObject", res);
}

hashMap(在此循环之后应包含以下内容:

{"entryObject":"500386787",
"dataObject":"500386883;500901929",
"dataObject":"500386906;500901969",
"dataObject":"500386787;500901666",
"dataObject":"500386784;500901654",
"dataObject":"500386762;500901599"}

但实际内容是:

{"entryObject":"500386787",
"dataObject":"500386762;500901599"}

正如你所看到的，它只存储了entryObject和最后一个dataObject。如何让它存储 hashMap 中的所有值？

Answer 1

它只存储最后一个条目，因为 HashMap 中不允许重复的键。要存储所有元素，您可以执行类似的操作

int count = 0;
for(String res : results) 
{
    log.info(res);
    resultHashMap.put("dataObject-"+count, res);
    count++;
}

因此你会得到这样的东西

{"entryObject":"500386787",
"dataObject-1":"500386883;500901929",
"dataObject-2":"500386906;500901969",
"dataObject-3":"500386787;500901666",
"dataObject-4":"500386784;500901654",
"dataObject-5":"500386762;500901599"}