Feb 22: ArrayList, Debugger

Learning Objectives

After today's class, you should be able to:

• Summarize the differences between arrays and ArrayLists.
• Describe how objects are stored in an ArrayList internally.
• Write code that manipulates an ArrayList using for loops.

Reminders

• By Friday 11pm: Do the Week 6 reading and take Quiz05
• By Monday 11pm: Complete Homework 5 (due Feb 26)

Lesson Outline

Act08 [50 min]

• Activity 8: ArrayList Objects
• Memory diagrams of ArrayLists

Demo [10 min]

• VS Code debugger

  • Setting breakpoints
  • Debugging unit tests

• Keyboard shortcuts

  • F5 = Continue
  • F10 = Step Over
  • F11 = Step Into

Mini Lecture [15 min]

• Checked vs Unchecked Exceptions
• throws keyword and @throws tag
• Two ways to handle an exception:
  • Use try-catch (in HW5 Board)
  • Declare throws (future homework)
  • Don't do both! (don't catch and throw)