What is a mock object?

From what I gathered when you create a mock object what is actually created is an interface (in a fashion) of the class you are simulating. All the methods of the simulated class are there but none of the original code is in them. The methods it simulates do nothing but catch what input is passed to them. The mock also gives you methods that will return info based on your criteria. Am I right?

What I mean by create an interface is that the mock
creates empty methods which share the same structure
as the class it's simulating. The class it's mocking
acts like an interface to the mock since it decides
what methods are required but it doesn't influence
how they are used. That's at least how I took it.No, the methods need not be empty. Where did you hear the term? Mocks can be incredibly useful, using a good mock objects package such as EasyMock, you can configure mock objects to return suitable, pre-defined values for various method calls, and also keep track of whether these methods were called or not, even down to the correct number of times

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The OP's problem is that the object under test calls a static method of a helper class, for which he wants to provide a mock class
Hence, he must break the code under test to call the mock class instead of the regular helper class (because static methods are not polymorphic)
that wouldn't have happened if this helper class had been coded to interfaces rather than static methods
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public class Helper() {
    public static void getSomeHelp();
public class MockHelper() {
    public static void getSomeHelp();
}do :
public class ClassUnderTest {
    private Helper helper;
    public void methodUnderTest() { // unchanged
        helper.getSomeHelp();
public interface Helper {
    public void getSomeHelp();
public class HelperImpl implements Helper {
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public class MockHelper implements Helper {
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Now I already know a solution that would work, creating a second constructor in the object I'm mocking which does nothing, then call the fake constructor from my mock object instead of the default constructor. The solution dosn't feel very elegent though, I'm wondering if I'm missing a simpler solution?

dsollen wrote:
I'm testing JMS communication between two applications. Each topic Listener has a reference to the main class of the respective applications to communicate with them.I still don't see why a call to the constructor should start the program. Change the design so that doesn't happen. You should instead provide a start method.
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my final yr proj is abt that and i really have no idea abt what is user-defined object...
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(duke point awarded of coz)

my final yr proj is abt that and i really have no
e no idea abt what is user-defined object...
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http://www.sap-img.com/abap/create-a-table-maintance-program-for-a-z-table.htm
http://help.sap.com/saphelp_nw04/helpdata/en/cf/21ed2d446011d189700000e8322d00/content.htm
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I need to display an editable ADF form where I can update the entity and the entity dates
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Entity Name: []
Opening Date: []
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What kind of view object would I need to create to achieve this?

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What is a mock object?

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