| | | Collections: unmodifiableSet(Set s) |
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/*
22.5
5
354.5676
*/
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
import javax.swing.JPanel;
/**
* Demonstrates the use of instance comparisons.
*
* @author <a href=mailto:[email protected]>Robert Simmons jr. (kraythe)</a>
* @version $Revision: 1.3 $
*/
public class InstanceOfDemo {
/** A set of demon objects. */
public static final Set OBJECT_SET;
static {
Set objectSet = new HashSet();
objectSet.add(new Integer(5));
objectSet.add(new String("Hardcore Java"));
objectSet.add(new Float(22.5f));
objectSet.add(new JPanel());
objectSet.add(new Character('x'));
objectSet.add(new ArrayList());
objectSet.add(new Double(354.5676));
objectSet.add(null);
OBJECT_SET = Collections.unmodifiableSet(objectSet);
}
/**
* Demo method.
*
* @param args Command Line arguments.
*/
public static void main(final String[] args) {
final Iterator iter = OBJECT_SET.iterator();
Object obj = null;
while (iter.hasNext()) {
obj = iter.next();
if (obj instanceof Number) {
System.out.println(obj);
}
}
}
}
/* ########## End of File ########## */
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| Related examples in the same category |
| 1. | Collections.EMPTY_LIST | | | | 2. | Collections.EMPTY_MAP | | | | 3. | Collections.EMPTY_SET | | | | 4. | Collections: binarySearch(List list, T key) | | | | 5. | Collections: comparator() | | | | 6. | Collections: copy(List dest, List src) | | | | 7. | Collections: emptyList() | | | | 8. | Collections: emptyMap() | | | | 9. | Collections: emptySet() | | | | 10. | Collections: enumeration(Collection c) | | | | 11. | Collections: fill(List list, R obj) | | | | 12. | Collections: list(Enumeration e) | | | | 13. | Collections: max(Collection < ? extends T > coll) | | | | 14. | Collections: min(Collection < ? extends T > coll) | | | | 15. | Collections: nCopies(int n, Object o) | | | | 16. | Collections: reverse(List list) | | | | 17. | Collections: reverseOrder() | | | | 18. | Collections: replaceAll(List list, T oldVal, T newVal) | | | | 19. | Collections: rotate(List list, int distance) | | | | 20. | Collections: shuffle(List < ? > list,Random rnd) | | | | 21. | Collections: singleton(T o) | | | | 22. | Collections: singletonList(T o) | | | | 23. | Collections: singletonMap(T key, R value) | | | | 24. | Collections: sort(List list) | | | | 25. | Collections: sort(List < T > list, Comparator < ? super T > c) | | | | 26. | Collections: swap(List list, int i, int j) | | | | 27. | Collections: synchronizedCollection(Collection c) | | | | 28. | Collections: synchronizedList(List list) | | | | 29. | Collections: synchronizedMap(Map m) | | | | 30. | Collections: synchronizedSet(Set s) | | | | 31. | Collections: synchronizedSet(SortedSet s) | | | | 32. | Collections: synchronizedSortedMap(SortedMap m) | | | | 33. | Collections: unmodifiableCollection(Collection c) | | | | 34. | Collections: unmodifiableList(List list) | | | | 35. | Collections: unmodifiableMap(Map m) | | |
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