構建Java物件的五種方法

• 使用new關鍵字

  Employee emp1 = new Employee();

• 使用Class.newInstance方法

  Employee emp2 = (Employee) Class.forName(“*.Employee”)
  .newInstance();
  
  OR
  
  Employee emp2 = Employee.class.newInstance();

• 使用Constructor類的newInstance()

  Constructor constructor = Employee.class.getConstructor();
  Employee emp3 = constructor.newInstance();

本質上，兩種newInstance方法都是反射，而事實上Class.newInstance方法內部呼叫的也是Constructor類的newInstance的方法，推薦使用Constructor類的newInstance的方法，像Spring、Hibernate、Struts等框架也就是使用的Constructor類的newInstance的方法

• clone()方法

  Employee emp4 = (Employee) emp3.clone();

• 使用deserialization反序列化

  ObjectInputStream in = new ObjectInputStream(new FileInputStream(“data.obj”));
  Employee emp5 = (Employee) in.readObject();

https://programmingmitra.blogspot.com/2016/05/different-ways-to-create-objects-in-java-with-example.html