Java TreeMap within TreeMap - Identifier error?

Question

This works fine:

TreeMap <String, ArrayList> x_probs_org = new TreeMap<String, ArrayList>();

But this:

TreeMap <String, TreeMap<String, Float>> x_probs = new <String, TreeMap<String, Float>>();

causes the following error:

error: <identifier> expected

Why? What am I doing wrong? I tried a couple of other ways but I don't see why this is wrong.

Note, rare types are bad - you want to make your `ArrayList` generic argument generic. Also it's conventional to use the interface type for the type of variables and parameters. — Tom Hawtin - tackline, Mar 20 '12 at 14:37

score 4 · Accepted Answer · answered Mar 20 '12 at 14:33

4

You forgot the TreeMap identifier:

.... = new TreeMap<String, TreeMap<String, Float>>();

answered Mar 20 '12 at 14:33

dacwe

score 1 · Answer 2 · answered Mar 20 '12 at 14:34

1

try it like that:

TreeMap <String, TreeMap<String, Float>> x_probs = new TreeMap<String, TreeMap<String, Float>>();

answered Mar 20 '12 at 14:34

Tom

2 Answers2