I need to write a simple function that will delete all entries in the List
that contains objects of the class Elem
. I wrote the function removeAllElements
, but it does not work if the size of the List<Elem>
is greater than 1.
public class Test {
public static void main(String[] args) {
Work w = new Work();
w.addElement(new Elem("a",new Integer[]{1,2,3}));
w.addElement(new Elem("b",new Integer[]{4,5,6}));
w.removeAllElements(); // It does not work for me.
}
}
public class Work {
private List<Elem> elements = new ArrayList<Elem>();
public void addElement(Elem e) {
this.elements.add(e);
}
public void removeAllElements() {
Iterator itr = this.elements.iterator();
while(itr.hasNext()) {
Object e = itr.next();
this.elements.remove(e);
}
}
}
public class Elem {
private String title;
private Integer[] values;
public Elem(String t,Integer v) {
this.title = t;
this.values = v;
}
}
Edit#1
The error message is the following:
Exception in thread "AWT-EventQueue-0" java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(Unknown Source)
at java.util.AbstractList$Itr.next(Unknown Source)
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