急！！！ Java 枚举 Enum --Swith..Case怎样操作枚举 求解?
- Java code
<p> <span style="font-family:Microsoft YaHei;font-size:13px;">求高手讲解：</span></p><p> <span style="font-family:Microsoft YaHei;font-size:13px;">我想通过使用switch...case来判断客户端传递的值,但不知道怎样使用这个枚举类,该枚举类定义如下：</span></p><pre class="java" name="code">package ts.bca.meta;import java.util.Arrays;import util.enumerate.base.EnumUtil;import util.enumerate.base.IntegerEnumTypeImp;/** * 流程定义中的任务类型枚举类 * * @category * @version $Revision: 1.3 $ Mar 25, 2010 * @date Mar 25, 2010 3:39:44 PM */public class EmergencyInfoReportStatesEnum extends IntegerEnumTypeImp { /** * serialUID. */ private static final long serialVersionUID = -1L; /** * @deprecated */ public EmergencyInfoReportStatesEnum() { super(); } /** * @param storeValue 存储值. ? */ private EmergencyInfoReportStatesEnum(int storeValue) { super(storeValue, EmergencyInfoReportStatesEnum.class.getName() + "." + storeValue, SystemEnumUtil.resource); } /** 空值型. */ public static final EmergencyInfoReportStatesEnum NULL = new EmergencyInfoReportStatesEnum(); /** * 1 报送中 */ final public static EmergencyInfoReportStatesEnum REPORTING = new EmergencyInfoReportStatesEnum(1); /** * 2 已报送 */ final public static EmergencyInfoReportStatesEnum REPORT_END = new EmergencyInfoReportStatesEnum(2); /** * 3 评估中 */ final public static EmergencyInfoReportStatesEnum ASSESS = new EmergencyInfoReportStatesEnum(3); /** * 4 已评估 */ final public static EmergencyInfoReportStatesEnum ASSESS_END = new EmergencyInfoReportStatesEnum(4); /** * 5 已删除 */ final public static EmergencyInfoReportStatesEnum DELETED = new EmergencyInfoReportStatesEnum(5); /** * 6 已关闭 */ final public static EmergencyInfoReportStatesEnum CLOSED = new EmergencyInfoReportStatesEnum(6); private static final EmergencyInfoReportStatesEnum[] ALL = {REPORTING, REPORT_END,ASSESS,ASSESS_END,DELETED,CLOSED}; static { Arrays.sort(ALL); } /** * 取得所有枚举 * * @return */ public static EmergencyInfoReportStatesEnum[] getAll() { return ALL; } /** * 根据键值取得枚举. * * @param code * @return */ public static final EmergencyInfoReportStatesEnum fromIntCode(final int code) { int pos = EnumUtil.search(ALL, code); return (pos >= 0) ? ALL[pos] : null; }}</pre><p> <br /> <span style="font-family:Microsoft YaHei;font-size:13px;">客户端传递过来的是一个int类型的值：</span></p><p> <span style="font-family:Microsoft YaHei;font-size:13px;">我这样写的：</span></p><pre class="java" name="code"> int code=event.getStates(); switch(code){ case 5: System.out.println("EventManageServiceImpl: 事件[ID="+eventId+"]已经被其他人删除."); break; default: //执行删除操作 System.out.println("EventManageServiceImpl: 事件[ID="+eventId+"]已经找到,即将被删除..."); event.setStates(5); break; }</pre><p> <br /> <span style="font-family:Microsoft YaHei;font-size:13px;">这根本就没有使用枚举呀....求高手讲讲,非常感谢!!!</span></p>[解决办法]
Java Switch 中的参数可以是byte, short, char, int, enum, String(JDK1.7)。
你的这个EmergencyInfoReportStatesEnum不是个enum！
这行int code=event.getStates();作用不清楚。
如果定要个enum，自己定义一个enum。
示例：
- Java code
public enum StateEnum { NULL(EmergencyInfoReportStatesEnum.NULL), REPORTING(EmergencyInfoReportStatesEnum.REPORTING), REPORT_END(EmergencyInfoReportStatesEnum.REPORT_END), ASSESS(EmergencyInfoReportStatesEnum.ASSESS), ASSESS_END(EmergencyInfoReportStatesEnum.ASSESS_END), DELETED(EmergencyInfoReportStatesEnum.DELETED), CLOSED(EmergencyInfoReportStatesEnum.CLOSED); private final EmergencyInfoReportStatesEnum value; StateEnum(EmergencyInfoReportStatesEnum value){ this.value = value; } public static StateEnum getState(int code){ EmergencyInfoReportStatesEnum state = EmergencyInfoReportStatesEnum.fromIntCode(code); if(state == null)return StateEnum.NULL; for(StateEnum se : StateEnum.values()){ if(se.value == state){ return se; } } return StateEnum.NULL; } public static void main(String[] args){// StateEnum state = StateEnum.getState(event.getStates())); StateEnum state = StateEnum.getState(1); switch (state) { case REPORTING: System.out.println(state.name()); break; case REPORT_END: System.out.println(state.name()); break; case ASSESS: System.out.println(state.name()); break; case ASSESS_END: System.out.println(state.name()); break; case DELETED: System.out.println(state.name()); break; case CLOSED: System.out.println(state.name()); break; default: System.out.println(state.name()); break; } }}