Arrays in Java

Posted on 2006-11-22
Last Modified: 2010-03-31
Hi I’m bit confused about the array system. Could anyone help me, How to create an array system which, we can enter multiple items. For example an inventory system which hold more than one information per product. How to create it and how to display it? (Just in dos mode to understand the system)

Like a class named as computer
Serial number     - string         default:??????
Model                 - string         default: Unknown
Laptop                - Boolean      default: false
Year purchased    - integer       default: -1
Question by:mysiva
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LVL 16

Accepted Solution

suprapto45 earned 250 total points
ID: 18001358
You create the JavaBean for that and put it into a kind like ArrayList or etc.

public class Computer {
    private String serialNumber;
    private String model;
    private boolean laptop;
    private int yearPurchased;
public String getSerialNumber() {
    return this.serialNumber;
public void setSerialNumber(String serialNumber) {
    this.serialNumber = serialNumber;
public String getModel() {
    return this.model;
public void setModel(String model) {
    this.model = model;
public boolean getLaptop() {
    return this.laptop;
public void setLaptop(boolean laptop) {
    this.laptop = laptop;
public int getYearPurchased() {
    return this.yearPurchased;
public void setYearPurchased(int yearPurchased) {
    this.yearPurchased = yearPurchased;


Then later, you can use it like

ArrayList arr = new ArrayList();
Computer c1 = new Computer();


Author Comment

ID: 18001405
Could you please write the full code, thus I can see how it’s works; and develop it more
LVL 24

Assisted Solution

sciuriware earned 250 total points
ID: 18001428
Make that:

    ArrayList<Computer> arr = new ArrayList<Computer>();  // Java 5 !

Other options:

     1) Give 'Computer' a full constructor :

            Computer u = new Computer(serial, model, false, 2006);

     2) Use an array sometimes:

            Computer[] list = new Computer[1000];

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LVL 16

Expert Comment

ID: 18001432
How if you post your current codes / progress?

I may need to go for meeting and will be back in few hours time

LVL 24

Expert Comment

ID: 18001434
mysiva, that was almost the full code.
If that was enough (all the answers), first take a basic course in JAVA.


Expert Comment

ID: 18003120
LOL Sciuriware......


you can always do this

Object arrayName[4];

arrayName[1] = new Integer();
arrayName[2] = new String;

That'd be customized arrays... (i think it works...)

but use a class.. its much easier.
LVL 24

Expert Comment

ID: 18003236
I gave that answer to you in another question.


Expert Comment

ID: 18003427
What answer?

for which one?


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