在java中更好的深度复制？

Question

是否有更快的深度复制技术可用于深度复制对象？我的类实现了Serializable

至于现在，我正在使用：

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class ObjectCloner {
    // so that nobody can accidentally create an ObjectCloner object
    private ObjectCloner() {
    }

    // returns a deep copy of an object
    @MetricsLogger(enableSuccessMetrics = true)
    static public Object deepCopy(Object oldObj) throws Exception {

        ObjectOutputStream outputStream = null;
        ObjectInputStream objectInputStream = null;
        try {
            if (oldObj != null) {
                ByteArrayOutputStream byteArrayOutputStream =  new ByteArrayOutputStream();
                outputStream = new ObjectOutputStream(byteArrayOutputStream);
                // serialize and pass the object
                outputStream.writeObject(oldObj);
                outputStream.flush();

                ByteArrayInputStream bin = new ByteArrayInputStream(byteArrayOutputStream.toByteArray());
                objectInputStream = new ObjectInputStream(bin);
                // return the new object
                return objectInputStream.readObject();

            } else {
                return null;
            }
        } catch (Exception e) {
            throw new RankingPolicyException("Exception while cloning : ", e);
        } finally {
            if (outputStream != null && objectInputStream != null) {
                objectInputStream.close();
                outputStream.close();
            }
        }
    }
}

这样可以正常工作但性能相当慢。如果有更好的方法可以进行深层复制，请告诉我。