JSONObject的getString()和optString()的区别

The difference is that

optString

returns
the empty string (

""

)
if the key you specify doesn't exist.

getString

on
the other hand throws a

JSONException

.
Use

getString

if
it's an error for the data to be missing, or

optString

if
you're not sure if it will be there.

这个是在stackoverflow上面看到的，mark一下，简单来说就是optString会在得不到你想要的值时候返回空字符串”“，而getString会抛出异常。