Java - enum (열거형 데이터 타입)

아래의 두 코드는 동일한 의미를 가진다.

class Fruit{
	public static final Fruit APPLE = new Fruit();
	public static final Fruit PEACH = new Fruit();
	public static final Fruit BANANA = new Fruit();    
}

enum Fruit{
	APPLE, PEACH, BANANA
}

 

APPLE 가져오기.

Fruit f = Fruit.APPLE;

 

생성자 설정하기

enum Fruit{
	APPLE("red"), PEACH("pink"), BANANA("yellow");
    
    private String color;
    
    public String getColor(){
    	return this.color;
    }
    
    Fruit(String color){
    	System.out.println("Call Constructor " + this);
        this.color = color;
    }
}

public class Demo{
	public static void main(String[] args){
    	
        Fruit type = Fruit.APPLE;
        switch(type){
        	case APPLE:
            	System.out.println(57 + " kcal, color " + Fruit.APPLE.color);
                break;
        	case PEACH:
            	System.out.println(34 + " kcal, color " + Fruit.PEACH.color);
                break;
        	case BANANA:
            	System.out.println(93 + " kcal, color " + Fruit.BANANA.color);
                break;
        }
                
		for ( Fruit f : Fruit.values()){
        	System.out.println(f);
        }
    }
}