JSF

h:selectOneMenu

Bean:

enum State {
    Alabama("AL"),Montana("MT"),Alaska("AK"),Nebraska("NE"),
    Arizona("AZ"),Nevada("NV"),Arkansas("AR"),NewHampshire("NH"),
    California("CA"),NewJersey("NJ"),Colorado("CO"),NewMexico("NM"),
    Connecticut("CT"),NewYork("NY"),Delaware("DE"),NorthCarolina("NC"),
    Florida("FL"),NorthDakota("ND"),Georgia("GA"),Ohio("OH"),Hawaii("HI"),
    Oklahoma("OK"),Idaho("ID"),Oregon("OR"),Illinois("IL"),Pennsylvania("PA"),
    Indiana("IN"),RhodeIsland("RI"),Iowa("IA"),SouthCarolina("SC"),Kansas("KS"),
    SouthDakota("SD"),Kentucky("KY"),Tennessee("TN"),Louisiana("LA"),Texas("TX"),
    Maine("ME"),Utah("UT"),Maryland("MD"),Vermont("VT"),Massachusetts("MA"),
    Virginia("VA"),Michigan("MI"),Washington("WA"),Minnesota("MN"),
    WestVirginia("WV"),Mississippi("MS"),Wisconsin("WI"),Missouri("MO"),Wyoming("WY");

     private String stateCode

    private State(String stateCode) {
        this.stateCode = stateCode;
    }

    public String getStateCode() {
        return stateCode;
    }
}

JSF:

//顯示簡寫
<f:selectItems value="#{bean.State}" var="state"
    itemValue="#{state}" itemLabel="#{state.stateCode}" />

//顯示全名
<f:selectItems value="#{bean.State}" var="state"
    itemValue="#{state.stateCode}" itemLabel="#{state}" />