CIS 260 TestHashtable.java

Code

/*
    TestHashtable.java
    David Klick
    CIS 260
    2009-03-23

    This program demonstrates a few features of the Hashtable class.
    Note that the datatypes could easily have been reversed within the
    program so that we were looking up Integers based on String values.
*/

import java.util.*;

public class TestHashtable {
    public static void main(String[] args) {
        Hashtable<Integer, String> ht = new Hashtable<Integer, String>();
        ht.put(31, "Sally Ford");
        ht.put(17, "John Buick");
        ht.put(96, "Edna Honda");
        ht.put(14, "Bob Chevrolet");
        ht.put(22, "Jack Lotus");
        ht.put(10, "Henry Toyota");

        Collection<String> coll = ht.values();
        for (String s : coll) System.out.println("   " + s);

        for (int i=0; i<=50; i++) {
            String s = ht.get(i);
            if (s != null) {
                System.out.println(i + ": " + s);
                ht.remove(i);
            }
        }

        coll = ht.values();
        for (String s : coll) System.out.println("    " + s);

    }
}

/*
    Sample output:

        John Buick
        Edna Honda
        Sally Ford
        Bob Chevrolet
        Henry Toyota
        Jack Lotus
    10: Henry Toyota
    14: Bob Chevrolet
    17: John Buick
    22: Jack Lotus
    31: Sally Ford
        Edna Honda
*/