Summary - Enum

Combine values, methods and switch to write a seasons app.

Summary - Enum

In this group you learned to declare enums, work with values and valueOf, add fields and methods, and branch with switch. Enums are a safe and readable way to handle fixed sets of constants.

Now you will combine everything to write a small seasons app: define a Season enum and produce a label and a message for each constant. This summary lesson has 5 steps and includes one code task.

Exercise Seasons app

Define a Season enum with SPRING and SUMMER constants. Each constant takes a String label (SPRING gets ilkbahar, SUMMER gets yaz). Start with Season s = Season.SPRING;, use switch to print ilkbahar in the SPRING branch.

Show example solution

enum Season {
  SPRING("ilkbahar"), SUMMER("yaz");
  String label;
  Season(String label) { this.label = label; }
}
// inside main:
Season s = Season.SPRING;
switch (s) {
  case SPRING: System.out.println(s.label); break;
}

Test yourself

Match each concept to its purpose

values()

All constants
valueOf()

Constant from name
switch

Branching
ordinal()

Order number

Find a constant with valueOf

Season s = Season.____("SUMMER");

Show answer

Season s = Season.valueOf("SUMMER");

What is the advantage of using an enum over using strings?
- Typos are caught at compile time
- Less code is written
- It runs faster
- It uses less memory
Show answer

Typos are caught at compile time — enum constants are checked at compile time; a wrong name is a compile error.

Next lesson: try/catch

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