Java create array of instance

Question

I have problem with my code here

Seller[] seller = new Seller[numberOfSellers];           // Declared global

// Some operations here

seller[i].setJoinDate(joinDate);
seller[i].setNumberOfPost(numberOfPost);
seller[i].setCustomerReview(customerReviewCount);
seller[i].setSafeTag(safeTag);

Then I have this Seller class with these methods

public void setJoinDate( String joinDate ) { this.joinDate = joinDate; }

public void setNumberOfPost( int numberOfPost ) { this.numberOfPost = numberOfPost; }

public void setCustomerReview( int customerReview ) { this.customerReview = customerReview; }

public void setSafeTag( String safeTag ) { this.safeTag = safeTag; }

Above is the shortened code of mine. If it is unclear please do point me where.

Basically I creating an array of instance. Then I will set the data.

Assuming the joinDate,numberOfPost,customerReviewCount,safeTag and lastly the numberOfSellers has no problem with is which it is.

The problem I had is at the setting of the data to the instance. Which is the setJoinDate,setNumberOfPost,setCustomerReview,setSafeTag. Anyone can help me detect my error here?

When I execute the program, it gives me this error

Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0
at fyp.draft.pkg1.Design.actionPerformed(Design.java:247)

Its the line where seller[i].setJoinDate(joinDate); located — user3054491
– user3054491, Commented Dec 17, 2013 at 10:57
@PakkuDon it is before the Seller[] seller = new Seller[numberOfSellers]; — user3054491
– user3054491, Commented Dec 17, 2013 at 10:57

zhujik · Accepted Answer · 2013-12-17 10:58:17Z

2

numberOfSellers doesn't seem to be set or equals zero at the time you run the code. example:

  public static int b;

  public static void main(String[] args) {

    Double[] d = new Double[b];

    d[5].doubleValue();
  }

leads to

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 5

answered Dec 17, 2013 at 10:58

zhujik

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1 Comment

user3054491 Over a year ago

My problem is solved. My problem is that I declared the Seller[] seller = new Seller[numberOfSellers]; at wrong place. I'm truly sorry for asking such a dumb question and wasting you guys time. But still your solution helps to provide me some hints in finding the error.

Andremoniy · Accepted Answer · 2013-12-17 10:58:38Z

1

Because of index equals 0 from provided exception, it seems that your variable numberOfSellers also equals 0. That means, that your array seller is always empty.

BTW There is no term global in Java. May be you mean that your array is static field of Class or just object variable (field)?

answered Dec 17, 2013 at 10:58

Andremoniy

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Comments

shikjohari · Accepted Answer · 2013-12-17 11:03:15Z

0

I think your number numberOfSellers is initialised to 0 as the error says.

You can try the following piece of code;

int numberOfSellers = 3;
Seller[] seller = new Seller[numberOfSellers];           // Declared global

for(int i = 0 ; i<seller.length ; i++){
seller[i] = new Seller();
seller[i].setJoinDate(joinDate);
seller[i].setNumberOfPost(numberOfPost);
seller[i].setCustomerReview(customerReviewCount);
seller[i].setSafeTag(safeTag);
}

answered Dec 17, 2013 at 11:03

shikjohari

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Michael A · Accepted Answer · 2013-12-17 10:56:55Z

-1

You need to initiallize the array:

 for(int i=0;i<numberOfSellers;i++)
 { 
    seller[i] = new seller();
 }

answered Dec 17, 2013 at 10:56

Michael A

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1 Comment

user3054491 Over a year ago

I did as you said and still get an error Exception in thread "AWT-EventQueue-0" java.lang.ArrayIndexOutOfBoundsException: 0

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