In this section you will learn how to know that whether any class consists No-Argument Constructor or not ?. Here is an example that provides the usage of the newInstance() method in more detail.

No Argument Constructor Example

     

In this section you will learn how to know that whether any class consists No-Argument Constructor or not ?. Here is an example that provides the usage of the newInstance() method in more detail.

Here in our example we have used "forName()" static method of Class and then we have invoked newInstance() method to create a new object without any argument. Invoking newInstance() method throws a NoSuchMethodException if the class does not have any no-argument constructor.

Here is code for example:

 

 

 

NoArgConstructor.java

import java.lang.reflect.*; import java.util.ArrayList; public class NoArgConstructor {   public static void main(String str[]){   try{  ArrayList list = (ArrayList)    (Class.forName("java.util.ArrayList").newInstance());  System.out.println("No-Argument Constructor exist.");  System.out.println("New Object created Successfully");   }catch(Exception e){   System.out.println("No-argument constructor does not exist.");   System.out.println(e.getMessage());   }  } }

Output:

Download Source code

Related Tags for No Argument Constructor Example:
c,  ide,  class,  constructor,  io,  struct,  method,  const,  vi,  new,  instance,  this,  id,  nsis,  ai,  usage,  example,  to,  learn,  tail,  exam,  argument,  ear,  e,  il,  des,  section,  not,  ce,  in,  no,  as,  sta,  m,  nt,  tr,  sage,  cl,  es,  sts,  age,  me,  how,  pro,  detail,  detail,  tor,  xa,  xamp,  s,  ctor,  at,  any,  k,  is,  ha,  ll,  mpl,  ea,  ar,  cons,  str,  sa,  usa,  wins,  s,  s,  th,  st,  hat,  cto,  ple,  pl,  pr,  on,  o

More Tutorials from this section

• Reflection API Tutorials and Examples
• Calling ( Invoking ) Methods through Reflection
• Class Modifier Example
• Retrieving the class name through Reflection API
• Getting information about Constructor
• Examine Interface Example
• Finding out the class fields
• Getting Component type
• Getting Fields Information of a class
• Identifying array using Reflection
• Reflection API Tutorials and Examples
• Getting the implemented Interfaces
• Getting Methods Information of a class
• Getting the method name used in the Application
• No Argument Constructor Example
• Finding out the object of the class
• Reflection API : A Brief Introduction
• Setting Fields Information of a class using Reflection
• Finding out the super class name of the class
• No Argument Constructor Example