hashMap.keySet（）的toArray（）。 //返回键阵列
 。hashMap.values​​（）的toArray（）; //返回值的数组
 

修改

应当指出，这两个阵列的顺序可能是不一样的，
见oxbow_lakes答案为是需要对键/值时，迭代一个更好的方法。

I need to convert a HashMap<String, Object> to an array; could anyone show me how it's done?

 hashMap.keySet().toArray(); // returns an array of keys
 hashMap.values().toArray(); // returns an array of values

Edit

Should be noted that the ordering of both arrays may not be the same, See oxbow_lakes answer for a better approach for iteration when the pair key/values are needed.