Help with abstract classes

Question

Hi All,
1. I would like to know if an abstract class can contain a main method?
2.I have a class called KeyTest which is a junit test class and it contains 2 methods called testSymKey() and testAsymKey() which bascially tests for symmetric key generation and assymmetric key generation. My manager has asked me to create an abstract test class for this class and define the methods in the abstract class and then make a subclass of this abstact class. I am not sure how this can be done!! Any help is appreciated.Here is what i have till now
public class KeyTest extends TestCase implements CSFConstants
public static void main(String[] args) throws Exception
junit.textui.TestRunner.run(suite());
protected void setUp() {
public static Test suite()
return(new TestSuite(KeyTest.class));
public void testSymKey() throws CSFException
CSFISymKey loSymKey = CSFManager.getInstance().getSymKey();
loSymKey.init();
loSymKey.generate();
assertTrue(loSymKey.save() != null);
public void testASymKey() throws CSFException
CSFIAsymKey loAsymKey = CSFManager.getInstance().getAsymKey();
loAsymKey.init();
loAsymKey.generate();
assertTrue(loAsymKey.getPublicKey().toString() != null);
assertTrue(loAsymKey.getPrivateKey().toString() != null);

Answer 1

If a class has one or more abstract methods (including if it claims to implement an interface but doesn't provide an implementation for one or more of the interface's methods, which are all implicitly abstract), then the class must be declared abstract.
However, the converse is not true. An abstract class can have all abstract methods, a mix of abstract and concrete methods, all concrete methods, or no methods at all. You can take any class you want and declare it abstract. (Of course, if you do, any code that does new ThatClass(); will now not compile.)