InstanceOfDemo.java Source code

Introduction

Here is the source code for InstanceOfDemo.java

Source

/*
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:kraythe@arcor.de>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 ########## */