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()