enum的使用

public interface Status {

    public String getValue();
}

public enum BooleanStatus implements Status {

    YES("Y"), NO("N");

    private final String value;

    private BooleanStatus(String value) {
        this.value = value;
    }

    public String getValue() {
        return value;
    }
}

objectInstance.setShowOnWindow(BooleanStatus.NO.getValue());
In this way,set the objectInstance's showOnWindow field is "N" string.
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存入int value 到数据库
public enum EmailStatusConstant implements Status {

    Email_STATUS_NEW("0"),

    Email_STATUS_APPROVED("1"),

    Email_STATUS_DELETED("2");

    private EmailStatusConstant(String value){
        this.value = value;
    }

    private String value;

    public String getValue() {
        return value;
    }

    public int getIntValue() {
        return Integer.parseInt(value);
    }

    @Override
    public String toString() {
        return value;
    }

}

int i=ActStatusConstant.ACT_STATUS_NEW.getIntValue()