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content/ta/spring2018/cpsc220/mar29.md

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+# Lecture for March 29th 
+
+## Enumerated Types
+
+These represent a fixed set of constants and include all possible values within them.
+
+Let's look at coins. On a daily basis in the US, we use the following coins:
+
+- Penny
+- Nickel
+- Dime
+- Quarter
+
+Other examples include the days of the week, clothes sizes, etc.
+
+## Enum Syntax
+
+Let's define an `enum` type
+
+```java
+public enum Coin { PENNY, NICKEL, DIME, QUARTER}
+```
+
+Now declare and initialize a variable
+
+```java
+Coin myCoin = Coin.PENNY
+```
+
+## Arrays vs ArrayList
+
+Arrays require you to say upfront, how many slots you need. ArrayLists are more flexible since you can change the length of the array during Runtime. 
+
+Arrays can store objects and primitives such as `int`, `char`, `boolean`, etc.
+
+ArrayLists can only store objects.
+
+### How to declare an ArrayList
+
+```java
+ArrayList<objectType> list = new ArrayList<objectType>();
+```
+
+### Differences between getting the length of the array
+
+**Array**
+
+```java
+int length = array.length;
+```
+
+**ArrayList**
+
+```java
+int length = array.size();
+```
+
+## For Each Loop
+
+This is a special loop in where you tell it to go through all the elements of the array, without specifying an index.
+
+```java
+for (String b : buildings) {
+    System.out.print(b);
+}
+```
+