Java Class forName() Method

The forName() method of Java Class class returns the Class object associated with the class or interface with the given name in the parameter as String.

Syntax

This method is overloaded in the following ways.

public static Class<?> forName(Module module,  String name)

public static Class<?> forName(String className) throws ClassNotFoundException

public static Class<?> forName(String name, boolean initialize, ClassLoader loader) throws ClassNotFoundException

Parameter

module - A module

name - The binary name of the class

className - the fully qualified name of the desired class.

name - the fully qualified name of the desired class

initialize - if true the class will be initialized.

loader - class loader from which the class must be loaded

Returns

class object representing the desired class.

Throws

LinkageError ,ExceptionInInitializerError , ClassNotFoundException SecurityException

Example 1

 import java.lang.*;
public class ClassforNameExample1 {
   public static void main(String[] args) {
      try {
         Class classlldr = Class.forName("java.lang.ClassLoader");  //lang class loader is passed as parameter
         System.out.println("Name of Class  = " + classlldr.getName());  //get the name of class
         System.out.println("Package Name  = " + classlldr.getPackage());//get the name of class
         System.out.println("Interface Name  = " + classlldr.getInterfaces());  //get the name of class
      } catch(ClassNotFoundException ex) {
         System.out.println(ex.toString()); //print  exception object
      }
   }
}

Test it Now

Output:

Name of Class  = java.lang.ClassLoader
Package Name  = package java.lang, Java Platform API Specification, version 1.8
Interface Name  = [Ljava.lang.Class;@7852e922

Example 2

import java.lang.*;
import java.lang.*;
public class ClassforNameExample2 {
public static void main(String[] args) {

      try {
         Class classlldr = Class.forName("java.lang.ClassLoader"); //lang class loader is passed as parameter
         System.out.println("Name of Class  = " + classlldr.getName());//get the name of class
         System.out.println("Package Name  = " + classlldr.getPackage());//get the package         System.out.println("Interface Name  = " + classlldr.getInterfaces());//get the Interface
         System.out.println("Construcors     = " + classlldr.getConstructors());//get the constructor 
         System.out.println("Classes        = " + classlldr.getClasses());//get the class
      } catch(ClassNotFoundException ex) {
         System.out.println(ex.toString());//print  exception object

      }
   }
}

Test it Now

Output:

Name of Class  = java.lang.ClassLoader
Package Name  = package java.lang, Java Platform API Specification, version 1.8
Interface Name  = [Ljava.lang.Class;@7852e922
Construcors     = [Ljava.lang.reflect.Constructor;@4e25154f
Classes        = [Ljava.lang.Class;@70dea4e

Next TopicJava Class

← prev next →