ArrayList

The Problem with Arrays. A Java array has a fixed length set when you create it. Once you write int[] a = new int[5];, the array can hold exactly five elements forever. If you need a sixth, you must allocate a brand new, larger array and copy every element acr

8 lessons, each with runnable code in the browser.

1. Why ArrayList? Arrays vs ArrayList
2. Adding and Accessing: add, get, size
3. Modifying: set and remove
4. Autoboxing and Wrapper Classes
5. Traversing with the Enhanced For Loop
6. Removing Elements During Traversal
7. Standard Algorithms on ArrayList
8. Putting It Together: Insertion Sort

Compilearn home