Explanation of Solution
Given: The mail-system project, an object of MailServer, and two objects of MailClient with their instance named sophia and juan. The sendMailItem method of sophia is already invoked and a breakpoint is already set at the first line of printNextMailItem and the Step button is pressed twice in the debugger option.
To find:Â The steps to invoke the printNextMailItem method again and then press the Step button again and observe the outcomes.
Solution:
First of all, it is necessary to continue or terminate the current execution by clicking the continue button or terminate button in order to invoke the printNextMailItem method again.
If the user invokes the printNextMailItem method before pressing continue or terminate button, then a window will pop-out by showing the error message.
After pressing the continue button, the user can now invoke the printNextMailItem method.
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Objects First with Java: A Practical Introduction Using BlueJ (6th Edition)
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