The retainAll() method only keeps the items that are common in both lists. We would get: Missing items from listOne ('Missing items from listOne ' + listTwo) Likewise, if we used: listTwo.removeAll(listOne) which consists of two source les named RunnerInfo. ('Missing items from listTwo ' + listOne) For comparing two dates, you have to write the program like this: First you have. What’s left is the additional or missing items.įor example when we compare two lists, listOne and listTwo and we want to find out what items are missing from listTwo we use: import ĪrrayList listOne = new ArrayList(Arrays.asList(1, 2, 3, 4, 5)) ĪrrayList listTwo = new ArrayList(Arrays.asList(1, 2, 4, 5, 6, 7)) The removeAll() method compares two lists and removes all the common items. The List interface also provides methods to find differences between two lists. List listTwo = Arrays.asList('a', 'c', 'b') List listOne = Arrays.asList('b', 'c', 'a') To compare two lists for equality just in terms of items regardless of their location, we need to use the sort() method from the Collections() class. How to loop through an ArrayList in Java.List listThree = Arrays.asList('c', 'a', 'b') īoolean isEqual = listOne.equals(listTwo) Īs you can see the equals() method compares the items and their location in the list.

List listTwo = Arrays.asList('a', 'b', 'c') List listOne = Arrays.asList('a', 'b', 'c') contain the same items and and appear in the same index then we can use: import If you want to check that two lists are equal, i.e. The List interface in Java provides methods to be able to compare two Lists and find the common and missing items from the lists.

Java compare two files