java - How to reference a class in an external JAR in Eclipse? -

java - How to reference a class in an external JAR in Eclipse? -

i reference class bag in jar file, eclipse telling me bag cannot resolved type. have added jar in bag defined classpath project, error still there. doing wrong?

i think can't that, because handbag class in algs4.jar within default package. before j2se 1.4, still can import classes default bundle using syntax this:

import unfinished;

but j2se 1.5, that's no longer allowed. if want access default bundle class within packaged class requires moving default bundle class bundle of own. read here more detail explanation :

how access java-classes in default-package?

some options can take :

access class via reflection or other indirect method. little bit hard, :

class fooclass = class.forname("foobar"); method foomethod = fooclass.getmethod("foomethod", new class[] { string.class });

string fooreturned = foomethod.invoke(fooclass.newinstance(), new string("i did it"));

if own source code of jar library, need set in bundle , wrap 1 time again new jar library.

java eclipse