How to reverse enum?

android, enums, java

Solution

There's a built-in `.values()` method that returns an array of all the enum constants. You can iterate it backwards.

Code[] values = Code.values();
for (int i = values.length - 1; i >= 0; i--) {
    Code next = values[i];
    //do your thing
}

Problem

I have an Enum class below ``` public class PTalkCommand { public enum Code { CLR((byte) 0), ACK((byte) 170), SER((byte) 0), NAK((byte) 0), TIMEOUT((byte) 255), DIP((byte) 173), REQUEST_CHECKSUM((byte) 162), REQUEST_STATUS((byte) 181), REQUEST_FLASH((byte) 166), REQUEST_CONFIG_READ((byte) 249), REQUEST_STATUS_SCREEN((byte) 208), REQUEST_MULTIPULSE_CONFIG((byte) 0), REQUEST_SERIAL_NUMBER((byte) 62), REQUEST_BILL_NAMES((byte) 64), DO_FLASH((byte) 161), DO_MOTOR((byte) 81), DO_SEND_EE_PROM_DATA((byte) 50), DO_ENTER_FILE_NAME((byte) 61), DO_ENTER_SERIAL_NUMBER((byte) 63), DO_CONFIGURE((byte) 248), DO_MULTIPULSE_CONFIG((byte) 210), DATA_COLLECTION_RAW_SENSORS((byte) 84), DATA_COLLECTION_MODE((byte) 0), DATA_COLLECTION_CAL_POINTS((byte) 0), DATA_COLLECTION_WITH_DEBUG((byte) 68), DATA_COLLECTION_EXIT((byte) 119), CALIBRATE_OAS((byte) 150), CALIBRATE_NOTE_PRESENT_PUNCH((byte) 0), CALIBRATE_CB_REMOVED((byte) 0), CALIBRATE_IR_BLUE_TRANSMISSIVE((byte) 0), CALIBRATE_IR_REFLECTIVE((byte) 0), CALIBRATE_BLUE_REFLECTIVE((byte) 0), CALIBRATE_MONITOR_VOLTAGES((byte) 0), STACKER_OR_STACKERLESS((byte) 158), CALIBRATE_CURVE_LEVER((byte) 0), REQUEST_BEZEL_REV_LEV((byte) 73), DO_BEZEL_UPDATE((byte) 82); private final byte valueCode; private Code(byte value) { this.valueCode = value; } public byte getValue() { return valueCode; } } } ``` And want it to get in reverse order. In .Net the code is like this ``` public void Prepend (PTalkCommand.Code[] commands) { IEnumerable<PTalkCommand.Code> enumerable = commands.Reverse<PTalkCommand.Code> (); foreach (PTalkCommand.Code current in enumerable) { base.Insert (0, (byte)current); } } ``` And in Java i am trying to do the same. ``` Enumeration<PTalkCommand.Code> enumerable = commands. ??????? ``` But, i am not able to do it. Please tell me how can i do the same in Java?

Original source