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Puzzle 57: What's in a Name?
This program consists of a simple immutable class that represents a name, with a main method that
puts a name into a set and checks whether the set contains the name. What does the program print?
import java.util.*;
public class Name {
private final String first, last;
public Name(String first, String last) {
this.first = first;
this.last = last;
}
public boolean equals(Object o) {
if (!(o instanceof Name))
return false;
Name n = (Name)o;
return n.first.equals(first) && n.last.equals(last);
}
public static void main(String[] args) {
Set<Name> s = new HashSet<Name>();
s.add(new Name("Mickey", "Mouse"));
System.out.println(
 
 
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