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To arrange for your arithmetic expression to be evaluated, you define
main, inside a class definition, such that the
arithmetic expression appears in that method.
public static void main (String argv[]) {
6 + 9 + 8;
}
To understand the main definition, you need to zoom in to look at it
piece by piece. Then, to use the main definition, you embed it in a
class definition, as you learn, in Segment 35.