Load and start a Java class dynamically

Question

Class<? extends Runnable> theClass = 
    Class.forName("C:\Myclass.class").asSubclass(Runnable.class);
Runnable instance = theClass.newInstance();
new Thread(instance).start();

I want to write like this C:\\Myclass.class

@Maroun85 dont we need to escape `.` as well ??, cuz `.` inregex mean match everything ?? — PermGenError, Nov 20 '12 at 10:47
possible duplicate of [Method to dynamically load java class files](http://stackoverflow.com/questions/6219829/method-to-dynamically-load-java-class-files) — Marko Topolnik, Nov 20 '12 at 10:48
@MarkoTopolnik what i meant was, dont we need to escape `.` like '\\.' to be treated as a dot character?? — PermGenError, Nov 20 '12 at 10:48
@GanGnaMStYleOverFlowErroR Since this is not a regex string, no, we don't — Marko Topolnik, Nov 20 '12 at 10:49

score 1 · Answer 1 · edited May 23 '17 at 11:56

1

Class.forName() takes a class name such as java.lang.Thread as parameter, not a file path. You have to load your class by using a dynamic ClassLoader

See: Method to dynamically load java class files

edited May 23 '17 at 11:56

Community

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answered Nov 20 '12 at 10:46

jabal

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score 0 · Answer 2 · answered Nov 20 '12 at 10:47

0

You have an error in your Class.forName().

You have to supply the fully qualified class name (FQCN) to this method.

If you want to load a certain class from an external source you have to write your own ClassLoader.

answered Nov 20 '12 at 10:47

Uwe Plonus

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Load and start a Java class dynamically

2 Answers2