探讨java深拷贝

public class SimpleDO implements Cloneable, Serializable {
    private int x = 1;
    private String s = "simpleDO";

    @Override
    protected Object clone() throws CloneNotSupportedException {
      SimpleDO newClass = (SimpleDO)super.clone();
      return newClass;
    }
  }

  public class ComplexDO implements Cloneable, Serializable {
    private int x = 1;
    private String s = "complex";
    private Integer a = 123;
    private Integer b = 1234;
    private Integer c = 1334455;
    private String s2 = "hehehe";
    private String s3 = "hahahaha";
    private Long id = 1233245L;
    private ArrayList<SimpleDO> l = new ArrayList<SimpleDO>();

    @Override
    public Object clone() throws CloneNotSupportedException {
      ComplexDO newClass = (ComplexDO) super.clone();
      newClass.l = new ArrayList<SimpleDO>();
      for (SimpleDO simple : this.l) {
        newClass.l.add((SimpleDO) simple.clone());
      }
      return newClass;
    }
  }

  public Object seirCopy(Object src) {
    try {
      ByteArrayOutputStream byteOut = new ByteArrayOutputStream();
      ObjectOutputStream out = new ObjectOutputStream(byteOut);
      out.writeObject(src);

      ByteArrayInputStream byteIn = new ByteArrayInputStream(byteOut.toByteArray());
      ObjectInputStream in = new ObjectInputStream(byteIn);
      Object dest = in.readObject();
      return dest;
    } catch (Exception e) {
      //do some error handler
      return null;
    }
 }

  public void testCloneComplex() throws CloneNotSupportedException {
    final int copyCount = 1;
    List<ComplexDO> complexDOList = new ArrayList<ComplexDO>(copyCount * 3);
    final ComplexDO complex = new ComplexDO();

    //调用二方库
    long start = System.currentTimeMillis();
    for(int i = 0; i < copyCount; ++i) {
      final ComplexDO deepClone = cloner.deepClone(complex);
      complexDOList.add(deepClone);
    }
    long end = System.currentTimeMillis();
    System.out.println("deepClone cost time=" + (end-start));

    //调用Cloneable接口实现的clone函数
    start = System.currentTimeMillis();
    for(int i = 0; i < copyCount; ++i) {
      final ComplexDO interfaceClone = (ComplexDO) complex.clone();
      complexDOList.add(interfaceClone);
    }
    end = System.currentTimeMillis();
    System.out.println("interfaceClone cost time=" + (end-start));

    //序列化与反序列化生成新对象
    start = System.currentTimeMillis();
    for(int i = 0; i < copyCount; ++i) {
      final ComplexDO seirClone = seirCopy(complex);
      complexDOList.add(seirClone);
    }
    end = System.currentTimeMillis();
    System.out.println("seirClone cost time=" + (end-start));
  }