- Arrays allow storing multiple values in a single variable. They are useful for problems that require working with several variables at once, like calculating exam averages for 100 students.
- Arrays are initialized with a size and values can be stored and retrieved using indexes. Common issues include accessing indexes outside the array bounds or failing to initialize arrays properly.
- Command line arguments provide a way to pass user input to a program via the command line when it is launched. The arguments are stored in a String array that is initialized for the program.