A Java ArrayList allows for duplicate and null values. A Java ArrayList is an ordered collection, and maintains the insertion order of the elements. You cannot create an ArrayList of primitive types ...

It's not terribly clean, but you could use indexOf() and check if it returns -1. Better than breaking out a loop.

So far, we have found ourselves using arrays to store most of our data. However, we have also noticed some limitations with arrays: You need to know the maximum size when you allocate it. You can’t ...