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140 Part II: Writing Your Own Java Programs In both kinds of loops, you define a variable. The loop in Listing 6-2 defines a variable named count. The loop in Listing 6-5 defines a variable named mySuspect. In both listings, the statements inside the loop refer to the newly defined variable. The loop in Listing 6-2 has the statement out.print(count); and the loop in Listing 6-5 has the statement out.print(mySuspect); During successive iterations, the printin Listing 6-2 stands for out.print(1), out.print(2), and so on. During successive iterations, the printin Listing 6-5 stands for out.print(mustard), out.print(plum), and so on. In both kinds of loops, you declare the type of value that the variable can have. In Listing 6-2, the variable countmust store an intvalue ( 7, 0, 5, 15, and so on). In Listing 6-5, the variable mySuspectmust refer to a Suspectvalue (mustard, plum, white, and so on). In fact, this declaring the type of value rule applies everywhere in Java not only in forloops. Every Java variable belongs to one type or another. In Listing 6-1, the line int numGuesses = 0; declares that numGuessesmust store an intvalue. The line goes on to say that, among all possible intvalues, the starting value for numGuessesis 0. Again in Listing 6-1, the line Scanner myScanner = new Scanner(System.in); declares that myScannermust refer to a Scannerobject. Among all such objects, the starting value for myScanneris an object that gets keystrokes from the keyboard (from System.in). In both kinds of loops, you specify a range of values. You specify the range of values that the variable takes on during the execution of the loop. In Listing 6-2, you narrow the countvariable s values to the numbers from 1 to 10. In Listing 6-5, you throw caution to the wind, and say that mySuspectgets to be every one of the items in Suspect.values().
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