Re: How to delete an entry from a Map?
www wrote On 11/16/07 15:36,:
Hi,
I cannot figure out how to delete an entry from a Map(HashMap). For
example, suppose I have a class Person and 3 objects of that
type(personA, personB and personC):
public class Person {
private String name;
....//
public String getName{
return name;
}
}
personA is with name of "John", personB and personC are with other names.
Map<Person> map = new HashMap<Person>();
//so easy to add to Map
map.add(personA);
map.add(personB);
map.add(personC);
...
//now, I want the map only has the guy with name of "John", i.e. I want
to delete personB and personC from map. I felt that it is so difficult.
You say you're using a Map, but your code sample seems
to be using a Set (and calling it a Map).
If it's a Map, you would have something like
Map<String,Person> map = new HashMap<String,Person>();
// add Persons:
map.put(personA.getName(), personA);
map.put(personB.getName(), personB);
map.put(personC.getName(), personC);
// remove two of them:
map.remove(personB.getName());
map.remove(personC.getName());
If it's a Set, it would look like
Set<Person> set = new HashSet<Person>();
// add Persons:
set.add(personA);
set.add(personB);
set.add(personC);
// remove two of them:
set.remove(personB);
set.remove(personC);
--
Eric.Sosman@sun.com