Activity 7: Enum Types

Provided Files

• Activity Packet
• Example Code – for Model 2

Documentation

• java.lang.Enum – methods that all enums have

Model 1 Code

Open JShell on your computer. Type (or copy and paste) the following enum definition:

public enum Month {
    JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC;
}

Then type each line of code below in JShell, one at a time, and record the results. You only need to record the output to the right of the ==> symbol. For example, if JShell outputs $8 ==> true, then just write true. If an error occurs, summarize the error message.

---

Month m = null;

m = JUN;

m = Month.JUN;

m.toString()

---

Month spring = Month.MAR;

Month summer = Month.JUN;

m == spring

m == summer

Month.JUL = summer;

---

m.ordinal()

spring.ordinal()

Month.OCT.ordinal()

m.compareTo(spring)

m.compareTo(Month.OCT)

---

m = Month.valueOf("Mar");

m = Month.valueOf("MAR");

m == spring

m = Month.valueOf(5);

m = new Month("HEY");

---

Month[] all = Month.values();

all[0]

all[11]

all[12]