2020-01-15 23:07:02 -05:00
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2022-02-15 01:14:58 -05:00
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2020-01-15 23:07:02 -05:00
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< h1 > Lecture for March 29th< / h1 >
< h2 > Enumerated Types< / h2 >
< p > These represent a fixed set of constants and include all possible values within them.< / p >
< p > Let's look at coins. On a daily basis in the US, we use the following coins:< / p >
< ul >
< li > Penny< / li >
< li > Nickel< / li >
< li > Dime< / li >
< li > Quarter< / li >
< / ul >
< p > Other examples include the days of the week, clothes sizes, etc.< / p >
< h2 > Enum Syntax< / h2 >
< p > Let's define an < code > enum< / code > type< / p >
< pre > < code class = "language-java" > public enum Coin { PENNY, NICKEL, DIME, QUARTER}< / code > < / pre >
< p > Now declare and initialize a variable< / p >
< pre > < code class = "language-java" > Coin myCoin = Coin.PENNY< / code > < / pre >
< h2 > Arrays vs ArrayList< / h2 >
< p > 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. < / p >
< p > Arrays can store objects and primitives such as < code > int< / code > , < code > char< / code > , < code > boolean< / code > , etc.< / p >
< p > ArrayLists can only store objects.< / p >
< h3 > How to declare an ArrayList< / h3 >
< pre > < code class = "language-java" > ArrayList< objectType> list = new ArrayList< objectType> ();< / code > < / pre >
< h3 > Differences between getting the length of the array< / h3 >
< p > < strong > Array< / strong > < / p >
< pre > < code class = "language-java" > int length = array.length;< / code > < / pre >
< p > < strong > ArrayList< / strong > < / p >
< pre > < code class = "language-java" > int length = array.size();< / code > < / pre >
< h2 > For Each Loop< / h2 >
< p > This is a special loop in where you tell it to go through all the elements of the array, without specifying an index.< / p >
< pre > < code class = "language-java" > for (String b : buildings) {
System.out.print(b);
}< / code > < / pre >
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