仿照Android的池化技术

/**
 * 仿照Android池化技术
 * @author fgtian
 *
 */
public class ObjectCacheTest {
  public static class ObjectItem {
    private static int sPoolSize = 0;
    private static final int MAX_CACHE = 10;
    private static final Object sPoolLock = new Object();
    private static ObjectItem sPool = null;

    private ObjectItem mNext = null;
    private int mValue;

    public static ObjectItem obtain() {
      synchronized (sPoolLock) {
        if (null != sPool) {
          ObjectItem item = sPool;
          sPool = item.mNext;
          item.mNext = null;
          --sPoolSize;
          return item;
        }
      }
      return new ObjectItem();
    }

    public static ObjectItem obtain(int value) {
      synchronized (sPoolLock) {
        if (null != sPool) {
          ObjectItem item = sPool;
          sPool = item.mNext;
          item.mNext = null;
          --sPoolSize;
          item.mValue = value;
          return item;
        }
      }
      return new ObjectItem(value);
    }

    public void recycle() {
      synchronized (sPoolLock) {
        if (sPoolSize < MAX_CACHE) {
          mValue = 0;
          this.mNext = sPool;
          sPool = this;

          sPoolSize++;
        }
      }
    }

    public ObjectItem() {

    }

    public ObjectItem(int value) {
      mValue = value;
    }

    @Override
    public String toString() {
      return String.valueOf(mValue);
    }
  }

  public static final void main(String[] args) {
    ObjectItem item1 = ObjectItem.obtain(1);
    item1.recycle();
    ObjectItem item2 = ObjectItem.obtain(3);
    if (item1 == item2) {
      System.out.println("YES, USE THE SAME OBJECT");
    } else {
      System.out.println("ERROR");
    }
  }
}