public enum ShipType {
    OneDeck,
    TwoDecks,
    ThreeDecks,
    FourDecks
}


и есть код в main

import static day0.ShipType.FourDecks;
import static day0.ShipType.ThreeDecks;

public class Task1 {
    private static String Cd_in;


    public static void main(String[] args) {
        Field field = new Field();
        int cnt_pnt = 0; // X-еx палубный корабль
        int j;

        for (int cnt_shps = 1; cnt_shps < 2; cnt_shps++) {
            cnt_pnt = 5 - cnt_shps; //сколько кораблей
                       ....................................................
                Ship sh1 = new Ship(FourDecks, coordinates);
               // Ship sh2 = new Ship(ThreeDecks, coordinates);

}

public enum ShipType {
    OneDeck (1),
    TwoDecks (2),
    ThreeDecks (3),
    FourDecks (4);
    

    public  int value;
    private static Map map = new HashMap<>();

    ShipType(int value) {this.value = value; }
    
    
    public static ShipType valueOf(int shipType){
        return (ShipType) map.get(shipType);
    }

    public int getValue() {
        return value;
    }
}