For Exercises 15 through 28, use the incremental development methodology to implement th...

For Exercises 15 through 28, use the incremental development methodology to implement the program. Design a visually appealing GUI with Swing components and layout managers. For each exercise, identify the program tasks, create a design document with class descriptions, and draw the program diagram. Map out the development steps at the start. Present any design alternatives and justify your selection. Be sure to perform adequate testing at the end of each development step.

Write a personal scheduler application. Each entry in the scheduler is an appointment, a to-do item, or a memo. Each entry has the date and the time it is entered. An entry can be locked, and if it is locked, the user cannot modify it. For an appointment entry, include the person and the place of meeting. For a to-do entry, include a short description of a task and the due date. For a memo, include a text. Implement the program with an attractive and elegant GUI.