(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
- User user = new User()
二.运用反射手段
(1)调用java.lang.Class.newInstance()
- <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()
- <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
- 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
- <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>