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Class forName() method in Java with Examples

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The forName() method of java.lang.Class class is used to get the instance of this Class with the specified class name. This class name is specified as the string parameter.
Syntax: 
 

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

Parameter: This method accepts the parameter className which is the Class for which its instance is required.
Return Value: This method returns the instance of this Class with the specified class name.
Exception: This method throws following Exceptions: 
 

  • LinkageError: if the linkage fails
  • ExceptionInInitializerError: if the initialization provoked by this method fails
  • ClassNotFoundException: if the class cannot be located

Below programs demonstrate the forName() method.
Example 1:
 

Java




// Java program to demonstrate forName() method
 
public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {
        // get the Class instance using forName method
        Class c1 = Class.forName("java.lang.String");
 
        System.out.print("Class represented by c1: "
                         + c1.toString());
    }
}


Output: 

Class represented by c1: class java.lang.String

 

Example 2:
 

Java




// Java program to demonstrate forName() method
 
public class Test {
    public static void main(String[] args)
        throws ClassNotFoundException
    {
        // get the Class instance using forName method
        Class c1 = Class.forName("java.lang.Integer");
 
        System.out.print("Class represented by c1: "
                         + c1.toString());
    }
}


Output: 

Class represented by c1: class java.lang.Integer

 

Reference: https://docs.oracle.com/javase/9/docs/api/java/lang/Class.html#forName-java.lang.String-
 



Last Updated : 01 Jun, 2021
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