list set还有数组转成json用jsonarray.fromobject 为啥地图和javabean是jsonobject.fromobject

list set还有数组转成json用jsonarray.fromobject 为啥map和javabean是jsonobject.fromobject
list set还有数组转成json用jsonarray.fromobject 为啥map和javabean是jsonobject.fromobject
------解决思路----------------------
map和bean是键---值对，而List,set不是