java-complex-enum.java

// https://leetcode.com/playground/otdz2h93


/*
Why?
- Readability
- Grouping of constants under one roof
- Compile Type Check
- Enumertion of values
- Unlike constants, we can store multiple values against a single enum type
*/

enum HappinessIndicator {
    Happy,
    Neutral,
    Dull
}
enum State {
    TN("Tamil Nadu", HappinessIndicator.Happy),
    AP("Andhra Pradesh", HappinessIndicator.Neutral),
    TG("Telangana", HappinessIndicator.Dull);
    
    State(String displayText, HappinessIndicator happinessIndicator) {
        this.displayText = displayText;
        this.happinessIndicator = happinessIndicator; 
    }
    
    String getDisplayText() {
        return displayText;
    }
    
    HappinessIndicator getHappinessIndicator() {
        return happinessIndicator;
    } 
    
    String displayText;
    HappinessIndicator happinessIndicator;
}

class Person {
    String name;
    State state;
    
    Person(String name, State state) {
        this.name = name;
        this.state = state;
    }
}
public class Main {
    public static void main(String[] args) {
        Person santhosh = new Person("Santhosh", State.TN);
        Person dheeraj = new Person("Dheeraj", State.TG);
        
        System.out.println(String.format("%s lives in: ", santhosh.name));
        System.out.println(santhosh.state);
        
        System.out.println("Looping all values in State");
        // get all values in enum
        State[] states = State.values();
        for(State state: states) {
            System.out.println(String.format("%s(%s) is %s", state.getDisplayText(), state, state.getHappinessIndicator().toString()));
        }
        
    }
}