?? ex19(1).java
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// holding/Ex19.java
// TIJ4 Chapter Holding, Exercise 19, page 422
// Repeat the previous exercise with a HashSet and a LinkedHashSet.
import java.util.*;
class Gerbil {
private int gerbilNumber;
public Gerbil(int i) {
gerbilNumber = i;
}
public void hop() {
System.out.println("gerbil " + gerbilNumber + " hops");
}
}
public class Ex19 {
public static void main(String[] args) {
Map<String, Gerbil> gerbils = new HashMap<String, Gerbil>();
gerbils.put("Fuzzy", new Gerbil(0));
gerbils.put("Spot", new Gerbil(1));
gerbils.put("Speedy", new Gerbil(2));
gerbils.put("Dopey", new Gerbil(3));
gerbils.put("Sleepy", new Gerbil(4));
gerbils.put("Happy", new Gerbil(5));
gerbils.put("Funny", new Gerbil(6));
gerbils.put("Silly", new Gerbil(7));
gerbils.put("Goofy", new Gerbil(8));
gerbils.put("Wowee", new Gerbil(9));
System.out.println(gerbils);
System.out.println();
Set<String> hashedKeys =
new HashSet<String>(gerbils.keySet());
System.out.println("HashSet: " + hashedKeys);
System.out.println();
Map<String, Gerbil> hashedGerbils =
new LinkedHashMap<String, Gerbil>();
for(String s : hashedKeys) {
System.out.print("Adding " + s + ", ");
hashedGerbils.put(s, gerbils.get(s));
}
System.out.println();
System.out.println();
System.out.println("From HashSet: " + hashedGerbils);
System.out.println();
Set<String> linkedHashedKeys =
new LinkedHashSet<String>(gerbils.keySet());
System.out.println("LinkedHashSet: " + linkedHashedKeys);
System.out.println();
Map<String, Gerbil> linkedHashedGerbils =
new LinkedHashMap<String, Gerbil>();
for(String s : linkedHashedKeys) {
System.out.print("Adding " + s + ", ");
linkedHashedGerbils.put(s, gerbils.get(s));
}
System.out.println();
System.out.println();
System.out.println("From LinkedHashSet: "
+ linkedHashedGerbils);
}
}
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