File Processing - Building Java Programs: A Back to Basics Approach - page 413

32 System.out.println("proximity, and I'll tell you where");

33 System.out.println("that zip code is located, along");

34 System.out.println("with a list of other zip codes");

35 System.out.println("within the given proximity.");

36 System.out.println();

37 }

38
39 // Searches for the given string in the input file; if found,

40 // returns the coordinates; otherwise returns (0, 0)

41 public static String find(String target, Scanner input) {

42 while (input.hasNextLine()) {

43 String zip = input.nextLine();

44 String city = input.nextLine();

45 String coordinates = input.nextLine();

46 if (zip.equals(target)) {

47 System.out.println(zip + ": " + city);

48 return coordinates;

49 }

50 }

51 // at this point we know the zip code isn't in the file

52 // we return fictitious (no match) coordinates

53 return "0 0";

54 }

55
56

// Shows all matches for the given coordinates within the

57 // given number of miles

58 public static void showMatches(String targetCoordinates,

59 Scanner input, double miles) {

60 Scanner data = new Scanner(targetCoordinates);

61 double lat1 = data.nextDouble();

62 double long1 = data.nextDouble();

63 System.out.println("zip codes within " + miles + " miles:");

64 while (input.hasNextLine()) {

65 String zip = input.nextLine();

66 String city = input.nextLine();

67 String coordinates = input.nextLine();

68 data = new Scanner(coordinates);

69 double lat2 = data.nextDouble();

70 double long2 = data.nextDouble();

71 double distance = distance(lat1, long1, lat2, long2);

72 if (distance <= miles) {

73 System.out.printf(" %s %s, %3.2f miles\n",

74 zip, city, distance);

75 }