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java iterator throwing awt-eventqueue exception

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0

I'm writing a program that adds items to a list and uses an iterator to print all of the items to a JTextArea. I'm a little confused because I thought it was because if there is no next, I'm trying to print a null statement, but doesn't the condition of the while loop check if there's a next object in the iterator?

I know the issue is only with the println, since if I remove it the program works fine. However, is there a way I can access the next object in the iterator as a string?

while (iter.hasNext())
 
 System.out.println(iter.next().toString());
 i++;
 r = i + " x " + formatter.formatLineItem(iter.next());
 

Here's the stack trace:

 Exception in thread "AWT-EventQueue-0" 
 java.lang.IndexOutOfBoundsException: Index 2 out-of-bounds for length 2
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
at java.base/java.util.Objects.checkIndex(Objects.java:372)
at java.base/java.util.ArrayList.get(ArrayList.java:440)
at Invoice$1.next(Invoice.java:56)
at Invoice$1.next(Invoice.java:48)
at Invoice.format(Invoice.java:80)

It's throwing a "AWT-Eventqueue-0" exception. I'm currently using the println to be able to see what exactly which items are in the iterator because I want to classify each item by name. However, I want to be able to access the string of the item that's in the iterator.

java iterator

share|improve this question

edited Mar 23 at 16:49

Jamie L.

asked Mar 23 at 16:45

Jamie L.Jamie L.

194

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  You call iter.next() twice after only one check to iter.hasNext(). Also, is this a custom Iterator? If there's no more elements then next() should throw NoSuchElementException, not IndexOutOfBoundsException.
  
  – Slaw
  Mar 23 at 16:53
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How can I refer to the same iter.next for both calls?
  
  – Jamie L.
  Mar 23 at 16:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Store the result in a local variable, then use the variable to reference the element.
  
  – Slaw
  Mar 23 at 16:55
  

  
  
  
  

add a comment | 

0

I'm writing a program that adds items to a list and uses an iterator to print all of the items to a JTextArea. I'm a little confused because I thought it was because if there is no next, I'm trying to print a null statement, but doesn't the condition of the while loop check if there's a next object in the iterator?

I know the issue is only with the println, since if I remove it the program works fine. However, is there a way I can access the next object in the iterator as a string?

while (iter.hasNext())
 
 System.out.println(iter.next().toString());
 i++;
 r = i + " x " + formatter.formatLineItem(iter.next());
 

Here's the stack trace:

 Exception in thread "AWT-EventQueue-0" 
 java.lang.IndexOutOfBoundsException: Index 2 out-of-bounds for length 2
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
at java.base/java.util.Objects.checkIndex(Objects.java:372)
at java.base/java.util.ArrayList.get(ArrayList.java:440)
at Invoice$1.next(Invoice.java:56)
at Invoice$1.next(Invoice.java:48)
at Invoice.format(Invoice.java:80)

It's throwing a "AWT-Eventqueue-0" exception. I'm currently using the println to be able to see what exactly which items are in the iterator because I want to classify each item by name. However, I want to be able to access the string of the item that's in the iterator.

java iterator

share|improve this question

edited Mar 23 at 16:49

Jamie L.

asked Mar 23 at 16:45

Jamie L.Jamie L.

194

• 
  
  
  

  
  3
  

  
  
  
  
  
  

  
  
  You call iter.next() twice after only one check to iter.hasNext(). Also, is this a custom Iterator? If there's no more elements then next() should throw NoSuchElementException, not IndexOutOfBoundsException.
  
  – Slaw
  Mar 23 at 16:53
  
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  How can I refer to the same iter.next for both calls?
  
  – Jamie L.
  Mar 23 at 16:55
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Store the result in a local variable, then use the variable to reference the element.
  
  – Slaw
  Mar 23 at 16:55
  

  
  
  
  

add a comment | 

I'm writing a program that adds items to a list and uses an iterator to print all of the items to a JTextArea. I'm a little confused because I thought it was because if there is no next, I'm trying to print a null statement, but doesn't the condition of the while loop check if there's a next object in the iterator?

I know the issue is only with the println, since if I remove it the program works fine. However, is there a way I can access the next object in the iterator as a string?

while (iter.hasNext())
 
 System.out.println(iter.next().toString());
 i++;
 r = i + " x " + formatter.formatLineItem(iter.next());
 

Here's the stack trace:

 Exception in thread "AWT-EventQueue-0" 
 java.lang.IndexOutOfBoundsException: Index 2 out-of-bounds for length 2
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
at java.base/java.util.Objects.checkIndex(Objects.java:372)
at java.base/java.util.ArrayList.get(ArrayList.java:440)
at Invoice$1.next(Invoice.java:56)
at Invoice$1.next(Invoice.java:48)
at Invoice.format(Invoice.java:80)

It's throwing a "AWT-Eventqueue-0" exception. I'm currently using the println to be able to see what exactly which items are in the iterator because I want to classify each item by name. However, I want to be able to access the string of the item that's in the iterator.

java iterator

share|improve this question

edited Mar 23 at 16:49

Jamie L.

asked Mar 23 at 16:45

Jamie L.Jamie L.

194

while (iter.hasNext())
 
 System.out.println(iter.next().toString());
 i++;
 r = i + " x " + formatter.formatLineItem(iter.next());
 

 Exception in thread "AWT-EventQueue-0" 
 java.lang.IndexOutOfBoundsException: Index 2 out-of-bounds for length 2
at java.base/jdk.internal.util.Preconditions.outOfBounds(Preconditions.java:64)
at java.base/jdk.internal.util.Preconditions.outOfBoundsCheckIndex(Preconditions.java:70)
at java.base/jdk.internal.util.Preconditions.checkIndex(Preconditions.java:248)
at java.base/java.util.Objects.checkIndex(Objects.java:372)
at java.base/java.util.ArrayList.get(ArrayList.java:440)
at Invoice$1.next(Invoice.java:56)
at Invoice$1.next(Invoice.java:48)
at Invoice.format(Invoice.java:80)

share|improve this question

edited Mar 23 at 16:49

Jamie L.

asked Mar 23 at 16:45

Jamie L.Jamie L.

194

share|improve this question

edited Mar 23 at 16:49

Jamie L.

asked Mar 23 at 16:45

Jamie L.Jamie L.

194

asked Mar 23 at 16:45

Jamie L.Jamie L.

194

asked Mar 23 at 16:45

Jamie L.Jamie L.

194