Collections.synchronizedList使用方法

ArrayList是非线程安全的,在多线程的情况下,向list插入数据的时候,可能会造成数据丢失的情况.并且一个线程在遍历List,另一个线程修改List,会报ConcurrentModificationException(并发修改异常)错误.

解决的方案有两种：Vector 或  Collections.synchronizedList(List list).

Vector

Vector是一个线程安全的List,但是它的线程安全实现方式是对所有操作都加上了synchronized关键字，这种方式严重影响效率.所以并不推荐使用Vector.

Collections.synchronizedList(List list)

Collections.synchronizedList

使用方法：

List<String> list = Collections.synchronizedList(new ArrayList<String>());
list.add("1");
list.add("2");
list.add("3");

synchronized (list) {
    Iterator i = list.iterator(); // Must be in synchronized block
    while (i.hasNext()) {
        //foo(i.next());
        System.out.println(i.next());
    }
}

为什么使用时在调用add()方法时不需要再加synchronized修饰，而遍历的时候需要加synchronized?

首先来看下Collections.synchronizedList的源码：

public static <T> List<T> synchronizedList(List<T> list) {
    return (list instanceof RandomAccess ?
            new SynchronizedRandomAccessList<>(list) :
            new SynchronizedList<>(list));
}

这个方法回根据你传入的List是否实现RandomAccess这个接口来返回的SynchronizedRandomAccessList还是SynchronizedList.

下面再看一下SynchronizedList的源码：

static class SynchronizedList<E>
    extends SynchronizedCollection<E>
    implements List<E> {
    private static final long serialVersionUID = -7754090372962971524L;

    final List<E> list;

    SynchronizedList(List<E> list) {
        super(list);
        this.list = list;
    }
    SynchronizedList(List<E> list, Object mutex) {
        super(list, mutex);
        this.list = list;
    }

    public boolean equals(Object o) {
        if (this == o)
            return true;
        synchronized (mutex) {return list.equals(o);}
    }
    public int hashCode() {
        synchronized (mutex) {return list.hashCode();}
    }

    public E get(int index) {
        synchronized (mutex) {return list.get(index);}
    }
    public E set(int index, E element) {
        synchronized (mutex) {return list.set(index, element);}
    }
    public void add(int index, E element) {
        synchronized (mutex) {list.add(index, element);}
    }
    public E remove(int index) {
        synchronized (mutex) {return list.remove(index);}
    }

    public int indexOf(Object o) {
        synchronized (mutex) {return list.indexOf(o);}
    }
    public int lastIndexOf(Object o) {
        synchronized (mutex) {return list.lastIndexOf(o);}
    }

    public boolean addAll(int index, Collection<? extends E> c) {
        synchronized (mutex) {return list.addAll(index, c);}
    }

    public ListIterator<E> listIterator() {
        return list.listIterator(); // Must be manually synched by user
    }

    public ListIterator<E> listIterator(int index) {
        return list.listIterator(index); // Must be manually synched by user
    }

    public List<E> subList(int fromIndex, int toIndex) {
        synchronized (mutex) {
            return new SynchronizedList<>(list.subList(fromIndex, toIndex),
                                        mutex);
        }
    }

    @Override
    public void replaceAll(UnaryOperator<E> operator) {
        synchronized (mutex) {list.replaceAll(operator);}
    }
    @Override
    public void sort(Comparator<? super E> c) {
        synchronized (mutex) {list.sort(c);}
    }
    ... ...
}

可以看出执行add()等方法的时候是加了synchronized关键字的,但是listIterator(),iterator()却没有加.所以在使用的时候需要加上synchronized.