解答
1.new
2.clone()
3.通过反射机制创建
1 2 3 | //用 Class.forName方法获取类,在调用类的newinstance()方法 Class<?> cls = Class.forName( "com.dao.User" ); User u = (User)cls.newInstance(); |
4.序列化反序列化
1 2 3 4 5 6 7 8 9 10 | //将一个对象实例化后,进行序列化,再反序列化,也可以获得一个对象(远程通信的场景下使用) ObjectOutputStream out = new ObjectOutputStream ( new FileOutputStream( "D:/data.txt" )); //序列化对象 out.writeObject(user1); out.close(); //反序列化对象 ObjectInputStream in = new ObjectInputStream( new FileInputStream( "D:/data.txt" )); User user2 = (User) in .readObject(); System.out.println( "反序列化user:" + user2); in .close(); |
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