ArrayList temp = test.get(i);
should be
ArrayList<String> temp = test.get(i);
Question
I have an ArrayList like : ArrayList<ArrayList<String>> test
for(int i = 0; i < test.size(); i++) {
ArrayList temp = test.get(i);
}
It turns out now, that I cannot do Arrays.deepToString(temp.toArray())
since temp is an Object and not < ArrayList< String>>.
Also, I am doing temp1.contains(temp.get())
temp1 and temp2 are actually objects with the same values < ArrayList< String>>. They even have some common ArrayLists within them. However, due to this Object problem, this does not work.
Is there any way by which I can basically return an ArrayList or so instead of an object so that I can get the .contains()
method to work. As I said... the ArrayList within temp has the same number of columns, some with the same values.
Please help me out.
Solution
ArrayList temp = test.get(i);
should be
ArrayList<String> temp = test.get(i);
OTHER TIPS
If you parameterize the ArrayList and pass over the return type to the toArray()
it should work fine.
for(int i = 0; i < test.size(); ++i){
ArrayList<String> temp = test.get(i);
temp.toArray(new String[]{});
}
The toArray()
now returns a String[]
ArrayList<ArrayList<String>> test=new ArrayList<>();
ArrayList<String> list=new ArrayList<>();
list.add("a");
list.add("b");
list.add("c");
test.add(list);
ArrayList<String> temp=new ArrayList<>();
for(ArrayList<String> arr:test) {
temp = arr;
}