private final static int TEST = 1;
    private final static int SHIFT = 2;
    private int coderType = SHIFT; // default value

    @Produces
    @Chosen
    @RequestScoped
    public Coder getCoder() {

        switch (coderType) {
            case TEST:
                return new TestCoderImpl();
            case SHIFT:
                return new CoderImpl();
            default:
                return null;
        }
    }

    @Inject
    @Chosen
    @RequestScoped
    Coder coder;

    <h2>String Encoder</h2>
        <p>Select Test or Shift, type a string and an integer, then click
            Encode.</p>
        <p>If you select Test, the TestCoderImpl bean will display the
            argument values.</p>
        <p>If you select Shift, the CoderImpl bean will return a string that
            shifts the letters in the original string by the value you specify.
            The value must be between 0 and 26.</p>
        <h:form id="encodeit">
            <h:selectOneRadio id="coderType"
                              required="true"
                              value="#{coderBean.coderType}">
                <f:selectItem
                    itemValue="1"
                    itemLabel="Test"/>
                <f:selectItem
                    itemValue="2"
                    itemLabel="Shift Letters"/>
            </h:selectOneRadio>
            ...