Name: auR10023 Date: 07/18/2001



AbstractCollection.addAll(Collection) does not throw
UnsupportedOperationException for empty Collection. The javadoc says:

public boolean addAll(Collection c)
...

Specified by:
          addAll in interface Collection
     Parameters:
          c - collection whose elements are to be added to this collection.
     Returns:
          true if this collection changed as a result of the call.
     Throws:
          UnsupportedOperationException - if the addAll method is not supported by
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
          this collection.
     See Also:
          add(Object)
...

Here is the example:

-----t.java-----
import java.util.*;

public class t {
    public static void main(String[] args) {
        ArrayList arrayList = new ArrayList();
        AbstractCollectionTest abCol = new AbstractCollectionTest();
        try {
            abCol.addAll(arrayList);
            System.out.println("addAll(Collection) does not throw " +
                               "UnsupportedOperationException");
        } catch(UnsupportedOperationException use) {
            System.out.println("addAll(Collection) throws " +
                               "UnsupportedOperationException");
        }
    }
}

class AbstractCollectionTest extends AbstractCollection {
    public AbstractCollectionTest() {
        super();
    }
    public Iterator iterator() {
        return new MyIterator();
    }
    public int size() {
        return 0;
    }
}

class MyIterator implements Iterator {
    public boolean hasNext() {
        return false;
    }
    public Object next() {
        return null;
    }
    public void remove() {
    }
}

----output----

#java -version
java version "1.4.0-beta_refresh"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta_refresh-b70)
Java HotSpot(TM) Client VM (build 1.4.0-beta_refresh-b70, mixed mode)

#java t

addAll(Collection) does not throw UnsupportedOperationException


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