Java instanceof on interface -

Java instanceof on interface -

i have next code dealing command line options:

i have these classes:

public enum dwelltimeoptions implements idwelltimeoptions{ public dwelltimeoptions findoption(string s){ homecoming null; } } public interface idwelltimeoptions extends ioptions{ public void compare(recontoolcompare rtc) throws recontoolexception; } public interface ioptions { public ioptions findoption(string s); }

the problem firstoption variable below doesn't appear instanceof ioptions, though believe should be.

object firstoption = null; seek { firstoption = class.forname("com.nim.tools.options." + capitalize(args.get(0)) + "options"); } grab (classnotfoundexception e) { // todo auto-generated grab block e.printstacktrace(); } if(firstoption instanceof ioptions){ secondoption = ((ioptions) firstoption).findoption(args.get(1).substring(1)); } else{ recontool.logerror("unrecognized option: \"" + args.get(0) + "\""); recontool.printoutoptions(); system.exit(0); }

firstoption variable "class com.nim.tools.options.dwelltimeoptions" , dwelltimeoptions class implements idwelltimeoptions extends ioptions...so dwelltimeoptions should instance of ioptions.

actually, think realized problem. firstoption variable class object , can't used in instanceof context , can't compared interface such ioptions?

class#forname returns instance of class<?>, in code:

firstoption = class.forname("com.nim.tools.options." + capitalize(args.get(0)) + "options");

if argument pass in args.get(0) i , have ioptions, firstoption same class<ioption> , not instance of object implements ioption interface.

firstoption variable class object , can't used in instanceof context , can't compared interface such ioptions

yes, assumption right.

java interface