Array List Pepper

Why not just primitive arrays Inserting is awkward Everything must shift Removal is awkward Common tasks Print an array Contains Index of Last Index Of Get size

Syntax Generic Class Class definition takes in a type parameter ArrayList<E> E is the type ArrayList<String> is "array list of type string" ArrayList<String> var = new ArrayList<String>() ArrayList<Player> var = new ArrayList<Player>() Think of the classname as ArrayList<Player> Also legal: ArrayList<String> var = new ArrayList<>() Call methods like any object: var.add("A value");

Add

Remove

Contains

Methods Write a method to add an element with "~" between every existing element

Looping issues The indexes and size keep changing

Insert ~ before each element Problem:

Insert ~ before each element Good

Removing every other Problem

Removing every other Good

Searching Write a replace method

Replace

Wrapper No primitives Wrap up into an Integer class AutoBoxing sometimes Equals problem

Summary Create an ArrayList: Use arraylist methods Wrap an integer ArrayList<String> v = new ArrayList<String>(); Use arraylist methods Understand size and indexes change with methods Wrap an integer