Coll2.java

/*
    Coll2.java
    David Klick
    CIS 260
    2/8/06

This program demonstrates a few features of the HashMap 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 Coll2 {
    public static void main(String[] args) {
        HashMap<Integer, String> hm = new HashMap<Integer, String>();
        hm.put(31, "Sally Ford");
        hm.put(17, "John Buick");
        hm.put(96, "Edna Honda");
        hm.put(14, "Bob Chevrolet");
        hm.put(22, "Jack Lotus");
        hm.put(10, "Henry Toyota");

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

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

coll = hm.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
*/