How to retrieve number of components added to JMenu?

assert, java, junit, swing

Solution

This occurs because the menu item isn't actually added to the `JMenu` itself, but is added to a popup menu internally, there is actually nothing added to the menu.

I think you will want to use `JMenu#getItemCount`, which "Returns the number of items on the menu, including separators" or, preferably, JMenu#getMenuComponentCount

Problem

I've done a small test and in the second test I get an assertion error (0 instead of 1): ``` package tests; import static org.junit.Assert.*; import org.junit.Test; import javax.swing.*; public class MenuTest { @Test public void testElementsAddition() { JMenuItem mItem1 = new JMenuItem(); JMenuItem mItem2 = new JMenuItem(); JMenu menu = new JMenu(); mItem1.add(mItem2); assertEquals(1, mItem1.getComponentCount()); menu.add(mItem1); assertEquals(1, menu.getComponentCount()); } } ``` Any Ideas why this might happen?

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