Custom Components

public class Bounty extends Component {
    private static final ComponentType<Bounty> TYPE =
        ComponentType.create(Bounty.class, Bounty::new);
    public static ComponentType<Bounty> getComponentType() {
        return TYPE;
    }
    private int amount;
    private String setBy;
    public Bounty() {
        this.amount = 0;
        this.setBy = null;
    }
    public int getAmount() { return amount; }
    public void setAmount(int amount) { this.amount = amount; }
    public String getSetBy() { return setBy; }
    public void setSetBy(String setBy) { this.setBy = setBy; }
}

// Add component to entity
Ref<EntityStore> ref = player.getEntityRef();
ref.add(Bounty.getComponentType(), new Bounty());
// Get component from entity
Holder<EntityStore> holder = ref.toHolder();
Bounty bounty = holder.getComponent(Bounty.getComponentType());
// Modify component
bounty.setAmount(100);
bounty.setSetBy("BountyHunter");
// Check if entity has component
if (holder.hasComponent(Bounty.getComponentType())) {
    // ...
}
// Remove component
ref.remove(Bounty.getComponentType());