(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 <span style="font-size: 14px;">Class.forName(classname).newInstance() Wife wife = (Wife) Class.forName("com.java.clone.Wife").newInstance();</span>
(2)调用java.lang.reflect.Constructor类的newInstance()
Java代码 <span style="font-size: 14px;">Constructor<Wife> constructor = Wife.class.getDeclaredConstructor(int.class,String.class); Wife wife = (Wife) constructor.newInstance(1,"nihao");</span>
三.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 <span style="font-size: 14px;">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 } }</span>
转载于:https://www.cnblogs.com/isoftware/p/3757180.html
