Normally breakpoints fire on each invocation. It is possible to configure breakpoints such that they fire when certain conditions are met; these are known as conditional breakpoints.
execute
method of the SampleHandler
class.execute
method body.3
, and click on OK.((org.eclipse.swt.widgets.Event)event.trigger).stateMask==65536
65536
is the value of SWT.MOD3
, which is the Alt key).When a breakpoint is created, it is enabled by default. A breakpoint can be temporarily disabled, which has the effect of removing it from the flow of execution. Disabled breakpoints can be easily re-enabled on a per breakpoint basis, or from the Breakpoints view. Quite often it's useful to have a set of breakpoints defined in the code base, but not necessarily have them all enabled at once.
It is also possible to temporarily disable all breakpoints using the Skip All Breakpoints setting, which can be changed from the corresponding item in the Run menu (when the Debug perspective is shown) or the corresponding icon in the Breakpoints view. When this is enabled, no breakpoints will be fired.
Conditional breakpoints must return a value. If the breakpoint is set to break whether or not the condition is true, it must be a Boolean expression. If the breakpoint is set to stop whenever the value changes, then it can be any Java expression. Multiple statements can be used provided that there is a return
keyword with a value expression.
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