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Array - length, initialise throughout, arrays or strings
Arrays example from a Well House Consultants training course
More on Arrays [link]
Source code: A365.java Module: J705
public class A365 {
public static void main (String [] args) { // We're going hold a table of ints (in this example) called "guests" int maxdays = 6; int [] guests; // guests in an integer array guests = new int[maxdays]; // Set it up to contain 7 values (0 thru 6) String [] daynames = // Set up, set size, initialise an array {"Sunday","Monday","Tuesday","Wednesday","Thursday","Friday"}; int sunny; // a variable for the day number ... // Read in numbers to that table ("array") for (sunny=0; sunny<guests.length; sunny++) { System.out.print("How many on "); System.out.print(daynames[sunny]); System.out.print(" night: "); guests[sunny] = (int)WellHouseInput.readNumber(); } // Check its there by spilling the beans! System.out.println("Let's see if I got that ..."); for (sunny=0; sunny<guests.length; sunny++) { System.out.print(guests[sunny]); System.out.print(" "); } System.out.println(); // Come up with a total of room-nights: int roomnights = 0; for (sunny=0; sunny<guests.length; sunny++) { roomnights += guests[sunny]; } System.out.print("Total roomnights: "); System.out.println(roomnights); // Look for busiest and quietest int busiest_sofar = guests[0]; int quietest_sofar = guests[0]; int busiest_posn = 0; int quietest_posn = 0; for (sunny=1; sunny<guests.length; sunny++) { if (guests[sunny] > busiest_sofar) { busiest_sofar = guests[sunny]; busiest_posn = sunny; } if (guests[sunny] < quietest_sofar) { quietest_sofar = guests[sunny]; quietest_posn = sunny; } } System.out.print("quietest was "); System.out.print(daynames[quietest_posn]); System.out.print(" with "); System.out.print(quietest_sofar); System.out.println(" guests"); System.out.print("busiest was "); System.out.print(daynames[busiest_posn]); System.out.print(" with "); System.out.print(busiest_sofar); System.out.println(" guests"); /* It runs like this: wizard:jn10 graham$ java A365 How many on Sunday night: 3 How many on Monday night: 5 How many on Tuesday night: 3 How many on Wednesday night: 5 How many on Thursday night: 4 How many on Friday night: 2 Let's see if I got that ... 3 5 3 5 4 2 Total roomnights: 22 quietest was Friday with 2 guests busiest was Monday with 5 guests wizard:jn10 graham$ */ } } Learn about this subject
This module and example are covered on the following public courses:
* Learning to Program in Java * Java Bootcamp * Java Programming for the Web Also available on on site courses for larger groups Books covering this topic
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Other Examples
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other closely related examples on the "Arrays" module index page.
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