[java] How to use ArrayList.addAll()?

I want to fill an ArrayList with these characters +,-,*,^ etc. How can I do this without having to add every character with arrayList.add()?

Use Arrays class in Java which will return you an ArrayList :

final List<String> characters = Arrays.asList("+","-");

You will need a bit more work if you need a List<Character>.

You can use Google guava as such:

ImmutableList<char> dirs = ImmutableList.of('+', '-', '*', '^');

May be this helps

List<String> l = Arrays.asList("+","-");

Assuming you have an ArrayList that contains characters, you could do this:

List<Character> list = new ArrayList<Character>();
list.addAll(Arrays.asList('+', '-', '*', '^'));

You can use the asList method with varargs to do this in one line:

java.util.Arrays.asList('+', '-', '*', '^');

If the list does not need to be modified further then this would already be enough. Otherwise you can pass it to the ArrayList constructor to create a mutable list:

new ArrayList(Arrays.asList('+', '-', '*', '^'));