Java.lang.Class.newInstance() Method


Advertisements


Description

The java.lang.Class.newInstance() creates a new instance of the class represented by this Class object. The class is instantiated as if by a new expression with an empty argument list. The class is initialized if it has not already been initialized. .

Declaration

Following is the declaration for java.lang.Class.newInstance() method

public T newInstance() throws InstantiationException, IllegalAccessException

Parameters

NA

Return Value

This method returns a newly allocated instance of the class represented by this object.

Exception

  • IllegalAccessException − if the class or its nullary constructor is not accessible.

  • InstantiationException − If this Class represents an abstract class, an interface, an array class, a primitive type, or void; or if the class has no nullary constructor; or if the instantiation fails for some other reason.

  • ExceptionInInitializerError − If the initialization provoked by this method fails.

  • SecurityException − If a security manager, s, is present.

Example

The following example shows the usage of java.lang.Class.newInstance() method.

package com.tutorialspoint;

import java.util.*;
import java.lang.*;

public class ClassDemo {

   public static void main(String[] args) {

      try {
         // date object
         Date d = new Date();
         Class cls = d.getClass();
         System.out.println("Time = " + d.toString());

         /* creates a new instance of the class represented by this 
            Class object cls */
         Object obj = cls.newInstance();
         System.out.println("Time = " + obj);
      } catch(InstantiationException e) {
         System.out.println(e.toString());
      } catch(IllegalAccessException e) {
         System.out.println(e.toString());
      }
   }
} 

Let us compile and run the above program, this will produce the following result −

Time = Tue Oct 23 16:09:55 MST 2012
Time = Tue Oct 23 16:09:55 MST 2012

java_lang_class.htm

Advertisements