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Right now, I have a program containing a piece of code that looks like this:
while (arrayList.iterator().hasNext()) { //value is equal to a String value if( arrayList.iterator().next().equals(value)) { // do something } } Am I doing that right, as far as iterating through the ArrayList goes?
The error I am getting is:
java.lang.ArrayIndexOutOfBoundsException: -1 at java.util.ArrayList.get(Unknown Source) at main1.endElement(main1.java:244) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDriver.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source) at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source) at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(Unknown Source) at main1.traverse(main1.java:73) at main1.traverse(main1.java:102) at main1.traverse(main1.java:102) at main1.main(main1.java:404) I would show the rest of the code, but it's pretty extensive, and if I am not doing the iteration correctly, I would assume the only possibility is that I am not initializing the ArrayList properly.
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The ArrayIndexOutOfBoundsException is one of the most common errors in Java. It occurs when a program attempts to access an invalid index in an array i.e. an index that is less than 0, or equal to or greater than the length of the array.
In order to avoid the java. lang. ArrayIndexOutOfBoundsException, you should always do the bound check before accessing array element e.g. Always remember that the array index starts at 0 and not 1 and an empty array has no element in it.
The ArrayIndexOutOfBoundsException occurs whenever we are trying to access any item of an array at an index which is not present in the array. In other words, the index may be negative or exceed the size of an array.
ArrayIndexOutOfBoundsException occurs when we access an array, or a Collection, that is backed by an array with an invalid index. This means that the index is either less than zero or greater than or equal to the size of the array.
Am I doing that right, as far as iterating through the Arraylist goes?
No: by calling iterator twice in each iteration, you're getting new iterators all the time.
The easiest way to write this loop is using the for-each construct:
for (String s : arrayList) if (s.equals(value)) // ... As for
java.lang.ArrayIndexOutOfBoundsException: -1
You just tried to get element number -1 from an array. Counting starts at zero.
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