Web Reference: From Java 10, you can use the var keyword to declare an ArrayList variable without writing the type twice. The compiler figures out the type from the value you assign. Mar 17, 2026 · ArrayList in Java is a resizable array provided in the java.util package. Unlike normal arrays, its size can grow or shrink dynamically as elements are added or removed. Oct 10, 2008 · Unless you know how many elements you have, and able to create the ArrayList with a proper initial capacity. In this case, using new ArrayList(list1.size() + list2.size()); would be extremely more efficient than even using addAll twice.
YouTube Excerpt: Arrays vs. ArrayLists - What's the difference? How do you use each of them, and which one should you use and why? We'll go ...
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