Solved

How do I build an array of objects with a Java 5 for loop?

Posted on 2006-07-18
8
277 Views
Last Modified: 2010-03-31
How do I build an array of objects with a Java 5 for loop?

I'd like to populate an array simliar to:

private static final SelectItem[] stateItems = new SelectItem[] {
        new SelectItem("Nebraska"),
        new SelectItem("Texas"),
        new SelectItem("Kansas"),
        new SelectItem("Iowa"),
};

in a loop.

Each SelectItem object value comes from a data source that I can loop through with a Java 5 for statement.

However, what is the proper approach to populate the SelectItem[] stateItems array?

I guess, I get used to using ArrayList, which has an add() method.

Any suggestions or examples are appreciated.

Thank you,

--Todd

0
Comment
Question by:jtp51
  • 2
  • 2
  • 2
  • +2
8 Comments
 
LVL 23

Expert Comment

by:Ajay-Singh
ID: 17135813
0
 
LVL 23

Expert Comment

by:Ajay-Singh
ID: 17135819
List<SelectItem> list = Arrays.asList(stateItems);
0
 
LVL 10

Expert Comment

by:mukundha_expert
ID: 17135968
>> How do I build an array of objects with a Java 5 for loop?

Object[] obj = new Object[5];
for ( int i =  0 ; i <  array.length ; i ++  )
 obj[i] = new Object() ;



>>SelectItem object value comes from a data source that I can loop through with a Java 5 for statement

if you can get the data from the statement, then form a array of that value ( String array)

say, String[] data = { your values} ;

for ( int i = 0 ; i < stateitems.length ; i ++ )
   stateitems [ i]  = new SelectItem ( data[i] ) ;


if you are using arrayList then,

ArrayList stateitems = new ArrayList () ;
for ( int i = 0 ; i < data.length ; i ++  )

stateitems.add ( new SelectItem ( data [ i ] ) ) ;

0
Does Powershell have you tied up in knots?

Managing Active Directory does not always have to be complicated.  If you are spending more time trying instead of doing, then it's time to look at something else. For nearly 20 years, AD admins around the world have used one tool for day-to-day AD management: Hyena. Discover why

 
LVL 10

Expert Comment

by:mukundha_expert
ID: 17135974
>>private static final SelectItem[]

if the array is final then you cannot change its reference later, it should be initialzed once it is declared,
0
 
LVL 26

Expert Comment

by:ksivananth
ID: 17135983
SelectItem[] stateItems = new SelectedItem[ 5 ] ;

for( int i = 0; i < 5; i++ ) stateItems[i] = new SelectedItem() ;

Not sure if this is what u wnated ;)
0
 
LVL 30

Expert Comment

by:Mayank S
ID: 17136085
They are not Java 5 for loops. But anyway, why would you want to use the enhanced for loop? I personally don't prefer it as it doesn't give as good performance as the simple for loop.
0
 
LVL 86

Expert Comment

by:CEHJ
ID: 17136804
Using new for loop would be something like

int ix = 0;
for (SelectItem si : dataSource) {
    stateItems[ix++] = si;
}
0
 
LVL 30

Accepted Solution

by:
Mayank S earned 50 total points
ID: 17138055
If you have them in an array-list/ collection, you can also directly use the toArray () method to get the values in an array.
0

Featured Post

Complete VMware vSphere® ESX(i) & Hyper-V Backup

Capture your entire system, including the host, with patented disk imaging integrated with VMware VADP / Microsoft VSS and RCT. RTOs is as low as 15 seconds with Acronis Active Restore™. You can enjoy unlimited P2V/V2V migrations from any source (even from a different hypervisor)

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
groupSum6 challenge 6 86
micro services spring boot application error 3 194
check java version using powershell 13 93
type mismatch (Object[] to double[] 4 24
Introduction This article is the first of three articles that explain why and how the Experts Exchange QA Team does test automation for our web site. This article explains our test automation goals. Then rationale is given for the tools we use to a…
In this post we will learn how to connect and configure Android Device (Smartphone etc.) with Android Studio. After that we will run a simple Hello World Program.
Viewers will learn one way to get user input in Java. Introduce the Scanner object: Declare the variable that stores the user input: An example prompting the user for input: Methods you need to invoke in order to properly get  user input:
This tutorial explains how to use the VisualVM tool for the Java platform application. This video goes into detail on the Threads, Sampler, and Profiler tabs.

778 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question