Summary

This lesson brings us to the end of our discussion on the core principles of object-oriented programming. In this lesson, we have looked at data types, algorithms, and strings.

We've seen how an array is an ordered collection of items of the same type. Arrays are declared with square brackets, [ ], and their size cannot be modified. Java provides the Arrays class from the collections framework that has extra methods we can use on arrays.

We also saw the concept of Arraylist and string. Java provides the StringBuilder class, which is basically a modifiable string. stringbuilder has length and capacity functions.