Possible Duplicate:
Java generics and array initialization
How does one instantiate an array of maps in Java?
I know I can do :
Map<String, Object> map = new HashMap<String, Object>();
so I should be able to :
Map<String, Object>[] maps = new HashMap<String, Object>[10];
but this does not work, gives compilation problem.
That's a quirk of generics in java. You have to declare the array like so:
HashMap<String, Object>[] maps = new HashMap[10];
later you can create each Map personally, example :
for(int i=0;i<10;i++)
{
maps[i] = new HashMap<String,Object>();
}
This is a consequence of erasure. The array is an array of HashMaps. The generic type param is not retained. You'll get a warning about this, but it will compile and you can suppress the warning with the @SuppressWarning("unchecked") annotation.
Listinstead of an old fashioned array? This question has by the way been asked a lot of times before. There might be some in the Related secton on the right column.