1.
public static void trouble(){
	ArrayList<String> strings = new ArrayList<String>();
	strings.add("banana");
}

2.
The only way to get something at index 1 (i.e. the second slot) is to first add
something in the first slot and then add what you want into the second slot.

public static void trouble(){
	ArrayList<String> strings = new ArrayList<String>();
	strings.add(""); // can add anything here, that will go in the first slot at index 0
	strings.add("banana");
}