Posted on 2006-11-05 17:47
苑 閱讀(211)
評論(0) 編輯 收藏 所屬分類:
java基礎學習系列
import?
java.io.Serializable;
import?
java.util.AbstractSet;
import?
java.util.ArrayList;
import?
java.util.Collection;
import?
java.util.Iterator;
import?
java.util.Set;
public?class?
MainClass?
{
??
public?static?
void?
main
(
String?args
[])?{
????
Set?map?=?
new?
ArraySet
()
;
????
map.add
(
"V"
)
;
????
map.add
(
"M"
)
;
????
map.add
(
"N"
)
;
????
System.out.println
(
map
)
;
??
}
}
class?
ArraySet?
extends?
AbstractSet?
implements?
Cloneable,?Serializable?
{
??
private?
ArrayList?list;
??
public?
ArraySet
()?{
????
list?=?
new?
ArrayList
()
;
??
}
??
public?
ArraySet
(
Collection?col
)?{
????
list?=?
new?
ArrayList
()
;
????
//?No?need?to?check?for?dups?if?col?is?a?set
????
Iterator?itor?=?col.iterator
()
;
????
if?
(
col?
instanceof?
Set
)?{
??????
while?
(
itor.hasNext
())?{
????????
list.add
(
itor.next
())
;
??????
}
????
}?
else?
{
??????
while?
(
itor.hasNext
())?{
????????
add
(
itor.next
())
;
??????
}
????
}
??
}
??
public?
Iterator?iterator
()?{
????
return?
list.iterator
()
;
??
}
??
public?
int?
size
()?{
????
return?
list.size
()
;
??
}
??
public?
boolean?
add
(
Object?element
)?{
????
boolean?
modified;
????
if?
(
modified?=?!list.contains
(
element
))?{
??????
list.add
(
element
)
;
????
}
????
return?
modified;
??
}
??
public?
boolean?
remove
(
Object?element
)?{
????
return?
list.remove
(
element
)
;
??
}
??
public?
boolean?
isEmpty
()?{
????
return?
list.isEmpty
()
;
??
}
??
public?
boolean?
contains
(
Object?element
)?{
????
return?
list.contains
(
element
)
;
??
}
??
public?
void?
clear
()?{
????
list.clear
()
;
??
}
??
public?
Object?clone
()?{
????
try?
{
??????
ArraySet?newSet?=?
(
ArraySet
)?
super
.clone
()
;
??????
newSet.list?=?
(
ArrayList
)?
list.clone
()
;
??????
return?
newSet;
????
}?
catch?
(
CloneNotSupportedException?e
)?{
??????
throw?new?
InternalError
()
;
????
}
??
}
}