• Java
    • JAXB Tutorial
      • What is JAXB
      • JAXB Marshalling Example
      • JAXB UnMarshalling Example
  • Spring Tutorial
    • Spring Core Tutorial
    • Spring MVC Tutorial
      • Quick Start
        • Flow Diagram
        • Hello World Example
        • Form Handling Example
      • Handler Mapping
        • BeanNameUrlHandlerMapping
        • ControllerClassNameHandlerMapping
        • SimpleUrlHandlerMapping
      • Validation & Exception Handling
        • Validation+Annotations
        • Validation+ResourceBundle
        • @ExceptionHandler
        • @ControllerAdvice
        • Custom Exception Handling
      • Form Tag Library
        • Textbox Example
        • TextArea Example
        • Password Example
        • Dropdown Box Example
        • Checkboxes Example
        • Radiobuttons Example
        • HiddenValue Example
      • Misc
        • Change Config file name
    • Spring Boot Tutorial
  • Hibernate Tutorial
  • REST Tutorial
    • JAX-RS REST @PathParam Example
    • JAX-RS REST @QueryParam Example
    • JAX-RS REST @DefaultValue Example
    • JAX-RS REST @Context Example
    • JAX-RS REST @MatrixParam Example
    • JAX-RS REST @FormParam Example
    • JAX-RS REST @Produces Example
    • JAX-RS REST @Consumes Example
    • JAX-RS REST @Produces both XML and JSON Example
    • JAX-RS REST @Consumes both XML and JSON Example
  • Miscellaneous
    • JSON Parser
      • Read a JSON file
      • Write JSON object to File
      • Read / Write JSON using GSON
      • Java Object to JSON using JAXB
    • CSV Parser
      • Read / Write CSV file
      • Read/Parse/Write CSV File – OpenCSV
      • Export data into a CSV File
      • CsvToBean and BeanToCsv – OpenCSV

JavaInterviewPoint

Java Development Tutorials

Java newInstance() method

September 15, 2015 by javainterviewpoint Leave a Comment

The newInstance() method of Class class is used to create a new instance of the class dynamically. We all know Class.forName() is used in loading the class dynamically and we will be using newInstance() method on top of it to create object dynamically. The newInstance() method of Class class can invoke only no-arg constructor of the class. 

Syntax : 

public T newInstance() throws InstantiationException, IllegalAccessException

Creates a new instance of the class represented by the Class object.

Example of newInstance() method

Lets now take a look into the below example for a better understanding.

public class Test 
{
    public Test()
    {
        System.out.println("Inside Test class constructor");
    }
    public void disp()
    {
        System.out.println("Disp() method called");   
    }
}
public class Logic 
{
    public static void main(String args[]) 
    {
        try {
            String someClassName = "com.javainterviewpoint.Test";
            Class clasz = Class.forName(someClassName);
            Test t = (Test)clasz.newInstance();
            t.disp();
        }
        catch (ClassNotFoundException e) 
        {
            e.printStackTrace();
        } catch (InstantiationException e) 
        {
            e.printStackTrace();
        } catch (IllegalAccessException e) 
        {
            e.printStackTrace();
        }
    }
}

Class.forName produces the object of type Class which encapsulates our “Test” class. The class Class has a method newInstance() which will create object for our Test class.

Output :

Inside Test class constructor
Disp() method called

Other interesting articles which you may like …

  • Abstract Class in Java
  • Interface in Java and Uses of Interface in Java
  • What is Marker Interface
  • Serialization and Deserialization in Java
  • Generate SerialVersionUID in Java
  • Java Autoboxing and Unboxing Examples
  • Use of Java Transient Keyword – Serailization Example
  • Use of static Keyword in Java
  • What is Method Overriding in Java
  • Encapsulation in Java with Example
  • Constructor in Java and Types of Constructors in Java
  • Final Keyword in Java | Java Tutorial
  • Java Static Import
  • Java – How System.out.println() really work?
  • Java Ternary operator
  • Java newInstance() method
  • Java Constructor.newInstance() method Example
  • Parameterized Constructor in Java

Filed Under: Core Java, Java Tagged With: Java, method, newInstance()

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.

Java Basics

  • JVM Architecture
  • Object in Java
  • Class in Java
  • How to Set Classpath for Java in Windows
  • Components of JDK
  • Decompiling a class file
  • Use of Class.forName in java
  • Use Class.forName in SQL JDBC

Oops Concepts

  • Inheritance in Java
  • Types of Inheritance in Java
  • Single Inheritance in Java
  • Multiple Inheritance in Java
  • Multilevel Inheritance in Java
  • Hierarchical Inheritance in Java
  • Hybrid Inheritance in Java
  • Polymorphism in Java – Method Overloading and Overriding
  • Types of Polymorphism in java
  • Method Overriding in Java
  • Can we Overload static methods in Java
  • Can we Override static methods in Java
  • Java Constructor Overloading
  • Java Method Overloading Example
  • Encapsulation in Java with Example
  • Constructor in Java
  • Constructor in an Interface?
  • Parameterized Constructor in Java
  • Constructor Chaining with example
  • What is the use of a Private Constructors in Java
  • Interface in Java
  • What is Marker Interface
  • Abstract Class in Java

Java Keywords

  • Java this keyword
  • Java super keyword
  • Final Keyword in Java
  • static Keyword in Java
  • Static Import
  • Transient Keyword

Miscellaneous

  • newInstance() method
  • How does Hashmap works internally in Java
  • Java Ternary operator
  • How System.out.println() really work?
  • Autoboxing and Unboxing Examples
  • Serialization and Deserialization in Java with Example
  • Generate SerialVersionUID in Java
  • How to make a class Immutable in Java
  • Differences betwen HashMap and Hashtable
  • Difference between Enumeration and Iterator ?
  • Difference between fail-fast and fail-safe Iterator
  • Difference Between Interface and Abstract Class in Java
  • Difference between equals() and ==
  • Sort Objects in a ArrayList using Java Comparable Interface
  • Sort Objects in a ArrayList using Java Comparator

Follow

  • Coding Utils

Useful Links

  • Spring 4.1.x Documentation
  • Spring 3.2.x Documentation
  • Spring 2.5.x Documentation
  • Java 6 API
  • Java 7 API
  • Java 8 API
  • Java EE 5 Tutorial
  • Java EE 6 Tutorial
  • Java EE 7 Tutorial
  • Maven Repository
  • Hibernate ORM

About JavaInterviewPoint

javainterviewpoint.com is a tech blog dedicated to all Java/J2EE developers and Web Developers. We publish useful tutorials on Java, J2EE and all latest frameworks.

All examples and tutorials posted here are very well tested in our development environment.

Connect with us on Facebook | Privacy Policy | Sitemap

Copyright ©2023 · Java Interview Point - All Rights Are Reserved ·