newInstance() method (Reflection Session-2)

newInstance() method

The newInstance() method of Class class and Constructor class is used to create a new instance of the class.

The newInstance() method of Class class can invoke zero-argument constructor whereas newInstance() method of Constructor class can invoke any number of arguments. So Constructor class is preferred over Class class.

---

Syntax of newInstance() method of Class class

public T newInstance()throws InstantiationException,IllegalAccessException

Here T is the generic version. You can think it like Object class. You will learn about generics later.

---

Example of newInstance() method

Let's see the simple example to use newInstance() method.

1.    class Simple{  

2.     void message(){System.out.println("Hello Java");}  

3.    }  

4.      

5.    class Test{  

6.     public static void main(String args[]){  

7.      try{  

8.      Class c=Class.forName("Simple");  

9.      Simple s=(Simple)c.newInstance();  

10.   s.message();  

11.   

12.   }catch(Exception e){System.out.println(e);}  

13.   

14.  }  

15. }  

Output:Hello java