Collections: unmodifiableSet(Set s)
/* 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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