TriStateCheckbox

@Named("triStateCheckboxView")
@ViewScoped
public class TriStateCheckboxView implements Serializable {

    private String value1;
    private String value2;
    private String value3;
    private String value4;

    @PostConstruct
    public void init() {
        value1 = "2";
        value4 = "1";
    }

    public String getValue1() {
        return value1;
    }

    public void setValue1(String value1) {
        this.value1 = value1;
    }

    public String getValue2() {
        return value2;
    }

    public void setValue2(String value2) {
        this.value2 = value2;
    }

    public String getValue3() {
        return value3;
    }

    public void setValue3(String value3) {
        this.value3 = value3;
    }

    public String getValue4() {
        return value4;
    }

    public void setValue4(String value4) {
        this.value4 = value4;
    }

    public void addMessage() {
        FacesMessage msg = new FacesMessage(FacesMessage.SEVERITY_INFO,
                "State has been changed", "State is = " + value2);
        FacesContext.getCurrentInstance().addMessage(null, msg);
    }
}