Main.java

public class Main {
  
    public static void main(String[] args) {
        Predator predator = new Predator(1, "name", 3, 2, new int[] {1, 3, 10}, new int[] {2, 6, 20}, "test");
        predation(1, predator);
    }

    private void predation(int victimLevel, Predator predator) {
        int dice = new Random().nextInt(6) + 1;
        int eatResult = predator.eatPower[predator.level - 1] * dice * (predator.level - victimLevel);
    }

}

Predator.java

public class Predator {

    public float id;

    public String name;

    public int rank;

    public int level;

    public int[] eatPower = new int[] {1, 10, -1};

    public int[] increasePower = new int[] {3, 20, -1};

    public String skill;

    public Predator(float id, String name, int rank, int level, int[] eatPower, int[] increasePower, String skill) {
        this.id = id;
        this.name = name;
        this.rank = rank;
        this.level = level;
        this.eatPower = eatPower;
        this.increasePower = increasePower;
        this.skill = skill;
    }
}