Access to ArrayList in Map in a different Class
49
What is a NullPointerException, and how do I fix it?
53085
How to initialize List object in Java?
68511
In Java 8 how do I transform a Map to another Map using a lambda?
125858
Save ArrayList to SharedPreferences
93211
When several classes need to access the same data, where should the data be declared?
109376
Is indexing a new map element and having something that reads it assigned to it undefined behaviour, or just unspecified?
59686
make arrayList.toArray() return more specific types
124572
EL access a map value by Integer key
126943
Instantiate objects in a List and use it
47233
Cannot perform instanceof check against parameterized type ArrayList
131864
Member '' cannot be accessed with an instance reference
36735
Add and remove items from list in other class in C#
104585
How to refer to the outer class in another instance of a non-static inner class?
89487
Is it safe to get values from a java.util.HashMap from multiple threads (no modification)?
29559
How to pass an ArrayList to a varargs method parameter?
150853
An object reference is required to access non-static member
119066
How to access private data members outside the class without making "friend"s?