四种创建对象的方法

(1) 用new语句创建对象，这是最常见的创建对象的方法。
(2) 运用反射手段,调用java.lang.Class或者java.lang.reflect.Constructor类的newInstance()实例方法。
(3) 调用对象的clone()方法。
(4) 运用反序列化手段，调用java.io.ObjectInputStream对象的 readObject()方法。

一.用new语句创建对象
Java代码

User user = new User()  

二.运用反射手段
(1)调用java.lang.Class.newInstance()
Java代码

Class.forName(classname).newInstance()  Wife wife = (Wife) Class.forName("com.java.clone.Wife").newInstance();  

(2)调用java.lang.reflect.Constructor类的newInstance()
Java代Constructor constructor = Wife.class.getDeclaredConstructor(int.class,String.class);
Wife wife = (Wife) constructor.newInstance(1,”nihao”); .调用对象的clone()方法
详情参考：http://ncs123.iteye.com/blog/1775631

Java代码

Wife wife = new Wife(1,"wang");  Wife wife2 = null;  wife2 = (Wife) wife.clone();//运用clone()方法产生新对象  

四.运用反序列化手段
被序列化的对象必须implements Serializable
Java代码

public class BeanUtil {      @SuppressWarnings("unchecked")      public static <T> T cloneTo(T src) throws RuntimeException {          ByteArrayOutputStream memoryBuffer = new ByteArrayOutputStream();          ObjectOutputStream out = null;          ObjectInputStream in = null;          T dist = null;          try {              out = new ObjectOutputStream(memoryBuffer);              out.writeObject(src);              out.flush();              in = new ObjectInputStream(new ByteArrayInputStream(                      memoryBuffer.toByteArray()));              dist = (T) in.readObject();          } catch (Exception e) {              throw new RuntimeException(e);          } finally {              if (out != null)                  try {                      out.close();                      out = null;                  } catch (IOException e) {                      throw new RuntimeException(e);                  }              if (in != null)                  try {                      in.close();                      in = null;                  } catch (IOException e) {                      throw new RuntimeException(e);                  }          }          return dist;      }      public static void main(String[] args){          Husband husband = new Husband(1);          Wife wife = new Wife(1,"jin");          husband.setWife(wife);          Husband husband2 = cloneTo(husband);//运用反序列生成了一个对象      }  }