[英]Syntax to declare an Arraylist containg an Arraylist in java
I have a class which I called Hour
, and I declared an Arraylist <day>
, which contains 24 elements of Hour
class. 我有一个称为
Hour
的类,并且声明了一个Arraylist <day>
,其中包含Hour
类的24个元素。
Now, I would like to declare an Arraylist of Arraylist<day>
but I am not sure about the syntax for that. 现在,我想声明一个Arraylist
Arraylist<day>
的Arraylist,但是我不确定其语法。
ArrayList <Hour> day = new ArrayList <Hour> (); //// just for test now
ArrayList <day> test = new ArrayList <day> ();
the problem is in this line 问题在这条线
ArrayList <day> test = new ArrayList <day> ();
正确的语法是
List<ArrayList<Hour>> = new ArrayList<ArrayList<Hour>>();
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