JDK中Collections的线程安全怎么实现
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摘要： 方法：publicstatic<T>Set<T>synchronizedSet(Set<T>s){returnnewSynchronizedSet<T>(s);}staticclassSynchronizedSet<E>extendsSynchronizedCollection<E>impl... ...
目录
(为您整理了一些要点),点击可以直达。
方法：
publicstatic<T>Set<T>synchronizedSet(Set<T>s){
returnnewSynchronizedSet<T>(s);
}
staticclassSynchronizedSet<E>
extendsSynchronizedCollection<E>
implementsSet<E>{
privatestaticfinallongserialVersionUID=487447009682186044L;
SynchronizedSet(Set<E>s){
super(s);
}
SynchronizedSet(Set<E>s,Objectmutex){
super(s,mutex);
}
publicbooleanequals(Objecto){
synchronized(mutex){returnc.equals(o);}
}
publicinthashCode(){
synchronized(mutex){returnc.hashCode();}
}
}
//useserialVersionUIDfromJDK1.2.2forinteroperability
privatestaticfinallongserialVersionUID=3053995032091335093L;
finalCollection<E>c;//BackingCollection
finalObjectmutex;//Objectonwhichtosynchronize
SynchronizedCollection(Collection<E>c){
if(c==null)
thrownewNullPointerException();
this.c=c;
mutex=this;
}
SynchronizedCollection(Collection<E>c,Objectmutex){
this.c=c;
this.mutex=mutex;
}
publicintsize(){
synchronized(mutex){returnc.size();}
}
publicbooleanisEmpty(){
synchronized(mutex){returnc.isEmpty();}
}
publicbooleancontains(Objecto){
synchronized(mutex){returnc.contains(o);}
}
publicObject[]toArray(){
synchronized(mutex){returnc.toArray();}
}
public<T>T[]toArray(T[]a){
synchronized(mutex){returnc.toArray(a);}
}
publicIterator<E>iterator(){
returnc.iterator();//Mustbemanuallysynchedbyuser!
}
publicbooleanadd(Ee){
synchronized(mutex){returnc.add(e);}
}
publicbooleanremove(Objecto){
synchronized(mutex){returnc.remove(o);}
}
publicbooleancontainsAll(Collection<?>coll){
synchronized(mutex){returnc.containsAll(coll);}
}
publicbooleanaddAll(Collection<?extendsE>coll){
synchronized(mutex){returnc.addAll(coll);}
}
publicbooleanremoveAll(Collection<?>coll){
synchronized(mutex){returnc.removeAll(coll);}
}
publicbooleanretainAll(Collection<?>coll){
synchronized(mutex){returnc.retainAll(coll);}
}
publicvoidclear(){
synchronized(mutex){c.clear();}
}
publicStringtoString(){
synchronized(mutex){returnc.toString();}
}
privatevoidwriteObject(ObjectOutputStreams)throwsIOException{
synchronized(mutex){s.defaultWriteObject();}
}
}
List和Map方法同理，这样，我们利用了装实模式，给我们的Map和List穿上了交通协管员的制服，减少了类爆炸，这就是装实模式；
packageorg;
publicclassAImpimplementsIA{
publicsynchronizedvoidsay(){
;
}
}
packageorg;
publicinterfaceIA{
publicvoidsay();
}
sychronized标识符是不影响接口的实现和继承的
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