Raymond Fung

Thanks guys!!!

It works now

Can anyone please tell me why in this program; I can retrieve "A" value from TreeMap but not HashMap.

It returns null value with HashMap.

Is there anyway that I can fix it?

Thanks
import java.util.*; public class Test2 { static void says(Map<APerson, String> map){ APerson a = new APerson("A"); System.out.println("A says - " + map.get(a)); } public static void main(String[] args) { SortedMap<APerson, String> sortedSayings = new TreeMap<APerson, String>(); sortedSayings.put(new APerson("A"), "I am A"); sortedSayings.put(new APerson("B"), "I am B"); says(sortedSayings); Map<APerson, String> sayings = new HashMap<APerson, String>(); sayings.put(new APerson("A"), "I am A"); sayings.put(new APerson("B"), "I am B"); says(sayings); } static class APerson implements Comparable<APerson>{ String name; public APerson(String name) { this.name = name; } public boolean equals(APerson o) { if (this == o) return true; if (o == null || getClass() != o.getClass()) return false; final APerson p = (APerson) o; return name.equals(p.name); } // Needed if this object is to be used as a key in a TreeMap public int compareTo(APerson o) { return this.name.compareTo(o.name); } } }
---------------------------Result---------------------------------
A says - I am A
A says - null

[I added [code] tags - Jim]
[ September 06, 2005: Message edited by: Jim Yingst ]