setters in constructor

Main.java

class Character {
    private String name;

    public void setName(String name) {
        this.name = name;
    }
}

class Enemy extends Character {
    public Enemy(String name) {
        this.setName(name); //this is dangerous 
    }
}

//somewhere far away
class EvalEnemy extends Enemy {

    private Integer evalLevel;

    public EvalEnemy(String name, int evalLevel) {
        super(name);
        this.evalLevel = evalLevel;
    }

    @Override
    public void setName(String name) {
        if (canBeNamed()) {
            super.setName(name);
        }
    }

    private boolean canBeNamed() {
        return evalLevel > 10;
    }
}

public class Main {
    public static void main(String[] args) {
        EvalEnemy oleg = new EvalEnemy("oleg", 10); //fails with NullPointerException
        System.out.println(oleg);
    }
}