JDK中Collections的线程安全怎么实现

发布时间：2022-04-06 16:32:06 作者：iii
来源：亿速云阅读：114

这篇“JDK中Collections的线程安全怎么实现”文章的知识点大部分人都不太理解，所以小编给大家总结了以下内容，内容详细，步骤清晰，具有一定的借鉴价值，希望大家阅读完这篇文章能有所收获，下面我们一起来看看这篇“JDK中Collections的线程安全怎么实现”文章吧。

方法：

public static <T> Set<T> synchronizedSet(Set<T> s) {
return new SynchronizedSet<T>(s);
}

static class SynchronizedSet<E>
extends SynchronizedCollection<E>
implements Set<E> {
private static final long serialVersionUID = 487447009682186044L;
SynchronizedSet(Set<E> s) {
super(s);
}
SynchronizedSet(Set<E> s, Object mutex) {
super(s, mutex);
}
public boolean equals(Object o) {
synchronized(mutex) {return c.equals(o);}
}
public int hashCode() {
synchronized(mutex) {return c.hashCode();}
}
}

// use serialVersionUID from JDK 1.2.2 for interoperability
private static final long serialVersionUID = 3053995032091335093L;
final Collection<E> c; // Backing Collection
final Object mutex; // Object on which to synchronize
SynchronizedCollection(Collection<E> c) {
if (c==null)
throw new NullPointerException();
this.c = c;
mutex = this;
}
SynchronizedCollection(Collection<E> c, Object mutex) {
this.c = c;
this.mutex = mutex;
}
public int size() {
synchronized(mutex) {return c.size();}
}
public boolean isEmpty() {
synchronized(mutex) {return c.isEmpty();}
}
public boolean contains(Object o) {
synchronized(mutex) {return c.contains(o);}
}
public Object[] toArray() {
synchronized(mutex) {return c.toArray();}
}
public <T> T[] toArray(T[] a) {
synchronized(mutex) {return c.toArray(a);}
}
public Iterator<E> iterator() {
return c.iterator(); // Must be manually synched by user!
}
public boolean add(E e) {
synchronized(mutex) {return c.add(e);}
}
public boolean remove(Object o) {
synchronized(mutex) {return c.remove(o);}
}
public boolean containsAll(Collection<?> coll) {
synchronized(mutex) {return c.containsAll(coll);}
}
public boolean addAll(Collection<? extends E> coll) {
synchronized(mutex) {return c.addAll(coll);}
}
public boolean removeAll(Collection<?> coll) {
synchronized(mutex) {return c.removeAll(coll);}
}
public boolean retainAll(Collection<?> coll) {
synchronized(mutex) {return c.retainAll(coll);}
}
public void clear() {
synchronized(mutex) {c.clear();}
}
public String toString() {
synchronized(mutex) {return c.toString();}
}
private void writeObject(ObjectOutputStream s) throws IOException {
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；

package org;
public class AImp implements IA {
public synchronized void say() {
;
}
}

package org;
public interface IA {
public void say();
}

sychronized标识符是不影响接口的实现和继承的

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JDK中Collections的线程安全怎么实现

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