Question

I have enumeration in JAVA code ERequestTypes my enumeration contains more then 20 elements, every element is a name of a function in my JAVA code. Now I want do following thing instead of writing switch(ERequestTypes) case and in the cases calling function in this way:

switch(ERequestTypes a) {
    case ERequestTypes.Initialize:
        Initialize();
    case ERequestTypes.Uninitialize:
        Uninitialize();
}

I want to do it with one line. All the functions in the enum have same argument and return same int value. How I can do that ? may be keep pointers of functions in enum like in C++ or something else. Please help !

class CRequestValue {
    /**
     * Constructor.
     * 
     * @param aName - Name of the request.
     * @param aCode - Code of the request.
     */
    public CRequestValue(String aName, int aCode) {
        this.mName = aName;
        this.mCode = aCode;
    }

    private String mName;
    private int    mCode;

    public String GetName() {
        return this.mName;
    }

    public int GetCode() {
        return this.mCode;
    }

} /* class CRequestValue **/

enum ERequestTypes
{
    Initialize(new CRequestValue("Initialize", 0)),
    Uninitialize(new CRequestValue("Uninitialize", 1)),
    GetDeviceInfoList(new CRequestValue("GetDeviceInfoList", 2)),
    GetDeviceInfo(new CRequestValue("GetDeviceInfo", 3));

    private CRequestValue mRequestValue;

    private ERequestTypes(CRequestValue aRequestValue) {
        this.mRequestValue = aRequestValue;
    }

    public String GetName() {
        return this.mRequestValue.GetName();
    }

    public int GetCode() {
        return this.mRequestValue.GetCode();
    }

} /* enum ERequestTypes **/

Answer 1

You’re looking for reflection.

ErequestTypes a = <init>;
Object o = Class.forName(<your class name>).getMethod(a.getName(), <argtype>.class).invoke(<instance of your class, or null if static method>, <arg>);

Note that the Class.forName is not required if you already know what class the methods are in.