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## org.apache.commons.collections.collection
Class SynchronizedCollection

    java.lang.Object
      org.apache.commons.collections.collection.SynchronizedCollection

All Implemented Interfaces:
  java.io.Serializable, java.lang.Iterable, java.util.Collection

Direct Known Subclasses:
  SynchronizedBag, SynchronizedBuffer, SynchronizedList, SynchronizedSet, SynchronizedSortedSet

    public class SynchronizedCollection

extends java.lang.Object
implements java.util.Collection, java.io.Serializable

Decorates another `Collection` to synchronize its behaviour for a multi-threaded environment.

Iterators must be manually synchronized:

     synchronized (coll) {
       Iterator it = coll.iterator();
       // do stuff with iterator
     }

This class is Serializable from Commons Collections 3.1.

Since:
  Commons Collections 3.0
Version:
  $Revision: 646777 $ $Date: 2008-04-10 13:33:15 +0100 (Thu, 10 Apr 2008) $
Author:
  Stephen Colebourne
See Also:
  Serialized Form

Field Summary
`protected java.util.Collection` | `collection` The collection to decorate
`protected java.lang.Object` | `lock` The object to lock on, needed for List/SortedSet views

Constructor Summary
`protected` | `SynchronizedCollection(java.util.Collection collection)` Constructor that wraps (not copies).
`protected` | `SynchronizedCollection(java.util.Collection collection, java.lang.Object lock)` Constructor that wraps (not copies).

Method Summary
`boolean` | `add(java.lang.Object object)`
`boolean` | `addAll(java.util.Collection coll)`
`void` | `clear()`
`boolean` | `contains(java.lang.Object object)`
`boolean` | `containsAll(java.util.Collection coll)`
`static java.util.Collection` | `decorate(java.util.Collection coll)` Factory method to create a synchronized collection.
`boolean` | `equals(java.lang.Object object)`
`int` | `hashCode()`
`boolean` | `isEmpty()`
`java.util.Iterator` | `iterator()` Iterators must be manually synchronized.
`boolean` | `remove(java.lang.Object object)`
`boolean` | `removeAll(java.util.Collection coll)`
`boolean` | `retainAll(java.util.Collection coll)`
`int` | `size()`
`java.lang.Object[]` | `toArray()`
`java.lang.Object[]` | `toArray(java.lang.Object[] object)`
`java.lang.String` | `toString()`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### collection

    protected final java.util.Collection collection

  The collection to decorate

### lock

    protected final java.lang.Object lock

  The object to lock on, needed for List/SortedSet views

Constructor Detail

### SynchronizedCollection

    protected SynchronizedCollection(java.util.Collection collection)

  Constructor that wraps (not copies).

  Parameters:
    `collection` - the collection to decorate, must not be null
  Throws:
    `java.lang.IllegalArgumentException` - if the collection is null

### SynchronizedCollection

    protected SynchronizedCollection(java.util.Collection collection,
                                     java.lang.Object lock)

  Constructor that wraps (not copies).

  Parameters:
    `collection` - the collection to decorate, must not be null
    `lock` - the lock object to use, must not be null
  Throws:
    `java.lang.IllegalArgumentException` - if the collection is null

Method Detail

### decorate

    public static java.util.Collection decorate(java.util.Collection coll)

  Factory method to create a synchronized collection.

  Parameters:
    `coll` - the collection to decorate, must not be null
  Returns:
    a new synchronized collection
  Throws:
    `java.lang.IllegalArgumentException` - if collection is null

### add

    public boolean add(java.lang.Object object)

  Specified by:
    `add` in interface `java.util.Collection`

### addAll

    public boolean addAll(java.util.Collection coll)

  Specified by:
    `addAll` in interface `java.util.Collection`

### clear

    public void clear()

  Specified by:
    `clear` in interface `java.util.Collection`

### contains

    public boolean contains(java.lang.Object object)

  Specified by:
    `contains` in interface `java.util.Collection`

### containsAll

    public boolean containsAll(java.util.Collection coll)

  Specified by:
    `containsAll` in interface `java.util.Collection`

### isEmpty

    public boolean isEmpty()

  Specified by:
    `isEmpty` in interface `java.util.Collection`

### iterator

    public java.util.Iterator iterator()

  Iterators must be manually synchronized.

       synchronized (coll) {
         Iterator it = coll.iterator();
         // do stuff with iterator
       }

  Specified by:
    `iterator` in interface `java.lang.Iterable`
  Specified by:
    `iterator` in interface `java.util.Collection`
  Returns:
    an iterator that must be manually synchronized on the collection

### toArray

    public java.lang.Object[] toArray()

  Specified by:
    `toArray` in interface `java.util.Collection`

### toArray

    public java.lang.Object[] toArray(java.lang.Object[] object)

  Specified by:
    `toArray` in interface `java.util.Collection`

### remove

    public boolean remove(java.lang.Object object)

  Specified by:
    `remove` in interface `java.util.Collection`

### removeAll

    public boolean removeAll(java.util.Collection coll)

  Specified by:
    `removeAll` in interface `java.util.Collection`

### retainAll

    public boolean retainAll(java.util.Collection coll)

  Specified by:
    `retainAll` in interface `java.util.Collection`

### size

    public int size()

  Specified by:
    `size` in interface `java.util.Collection`

### equals

    public boolean equals(java.lang.Object object)

  Specified by:
    `equals` in interface `java.util.Collection`
  Overrides:
    `equals` in class `java.lang.Object`

### hashCode

    public int hashCode()

  Specified by:
    `hashCode` in interface `java.util.Collection`
  Overrides:
    `hashCode` in class `java.lang.Object`

### toString

    public java.lang.String toString()

  Overrides:
    `toString` in class `java.lang.Object`

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