©TCP-tryJAVA

enum Rainbow { RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, VIOLET }

public class prog {
	public static void main(String[] args) {
		int idx = Rainbow.YELLOW.ordinal();
		
		System.out.println(idx);
	}
}

​x
 
enum Rainbow { RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO, VIOLET }
​
public class prog {
    public static void main(String[] args) {
        int idx = Rainbow.YELLOW.ordinal();
        
        System.out.println(idx);
    }
}