public class EnumTest {
enum RadioState {
RADIO_OFF, /* Radio explictly powered off (eg CFUN=0) */
RADIO_UNAVAILABLE, /* Radio unavailable (eg, resetting or not booted) */
SIM_NOT_READY, /* Radio is on, but the SIM interface is not ready */
SIM_LOCKED_OR_ABSENT, /* SIM PIN locked, PUK required, network
personalization, or SIM absent */
SIM_READY, /* Radio is on and SIM interface is available */
RUIM_NOT_READY, /* Radio is on, but the RUIM interface is not ready */
RUIM_READY, /* Radio is on and the RUIM interface is available */
RUIM_LOCKED_OR_ABSENT, /* RUIM PIN locked, PUK required, network
personalization locked, or RUIM absent */
NV_NOT_READY, /* Radio is on, but the NV interface is not available */
NV_READY; /* Radio is on and the NV interface is available */
public boolean isOn() /* and available...*/ {
return this == SIM_NOT_READY
|| this == SIM_LOCKED_OR_ABSENT
|| this == SIM_READY
|| this == RUIM_NOT_READY
|| this == RUIM_READY
|| this == RUIM_LOCKED_OR_ABSENT
|| this == NV_NOT_READY
|| this == NV_READY;
}
public boolean isAvailable() {
return this != RADIO_UNAVAILABLE;
}
public boolean isSIMReady() {
return this == SIM_READY;
}
public boolean isRUIMReady() {
return this == RUIM_READY;
}
public boolean isNVReady() {
return this == NV_READY;
}
public boolean isGsm() {
return this == SIM_NOT_READY
|| this == SIM_LOCKED_OR_ABSENT
|| this == SIM_READY;
}
public boolean isCdma() {
return this == RUIM_NOT_READY
|| this == RUIM_READY
|| this == RUIM_LOCKED_OR_ABSENT
|| this == NV_NOT_READY
|| this == NV_READY;
}
}
public static void main(String[] args) {
RadioState mRS = RadioState.RADIO_OFF;
System.out.println("RadioState isOn: " + mRS.isOn());
System.out.println("RadioState.RADIO_OFF: " + mRS.RADIO_OFF);
}
}
1. RadioState枚举类就是class，而且是一个不可以被继承的final类。其枚举值(RADIO_OFF...)都是RadioState类型的静态常量，
2. 即然枚举类是class，当然在枚举类型中有构造器，方法和数据域。但是，枚举类的构造器有很大的不同：
(1) 构造器只是在构造枚举值的时候被调用。
(2) 构造器只能私有private，绝对不允许有public构造器。
3. 所有枚举类都继承了Enum的方法.
