It is necessary to know how many resources are allocated in order to know whether the leak has been plugged or not. Fortunately, SWT provides a mechanism to do this via the Display and the DeviceData class. Normally, this is done by a separate plug-in, but in this example, the ClockView will be modified to show this behavior.
At the start of the
ClockViewclass'screatePartControlmethod, add a call to obtain the number of allocated objects, via theDeviceDataof theDisplayclass:public void createPartControl(Composite parent) { Object[] objects = parent.getDisplay().getDeviceData().objects;Iterate through the allocated
objects, counting how many are instances ofColor:int count = 0; for (int i = 0; i < objects.length; i++) { if (objects[i] instanceof Color) { count++; } }Print the
countto the standard error stream:System.err.println("There are " + count + " Color instances");Now run the code in debug mode and show the Clock View...