Check if an ArrayList contains every element from another ArrayList (or Collection)

Question

There is probably a simple one-liner that I am just not finding here, but this is my question:

How do I check if an ArrayList contains all of the objects in another ArrayList? I am looking (if it exists) for something along the lines of:

//INCORRECT EXAMPLE: if(one.contains(two)) {     return true; } else {     return false; } 

For example:

ArrayList one = {1, 2, 3, 4, 5}  ArrayList two = {1, 2, 3} --> True ArrayList two = {} --> True ArrayList two = {1, 2, 3, 4, 5} --> True ArrayList two = {1, 5, 2} --> True ArrayList two = {1, 7, 4} --> False ArrayList two = {0, 1, 3} --> False ArrayList two = {4, 5, 6} --> False ArrayList two = {7, 8, 9} --> False 

Answer 1

There is a method called containsAll declared in the java.util.Collection interface. In your setting one.containsAll(two) gives the desired answer.

Answer 2

Per the List interface:

myList.containsAll(...);