Double-click the line number of the line for which you want to check the operation and mark it with ●.
(● mark: called "breakpoint")
Select Debug from the Run menu or click Debug on the toolbar to start debugging.
Switch perspectives for debugging.
(1) Lines marked with ● will be stopped before execution.
(2) Check the value of variables and the order of execution.
③ Click "Resume" on the toolbar to continue execution.
④ After checking all the lines, switch the perspective to "Java".
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