Guided Notes

Arrays

Creating arrays, indexes and length, looping through arrays, the Arrays class, and 2-D arrays.

Creating arrays

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An array stores a fixed number of values of one type:

String[] cars = {"Volvo", "BMW", "Ford"}; int[] scores = new int[5]; // five zeros

Access elements by index, starting at 0: cars[0] → "Volvo" cars[1] = "Opel"; // change an element cars.length → 3

An array's size is fixed when it's created. Using an index outside 0 to length − 1 throws ArrayIndexOutOfBoundsException.

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