Java Class asSubclass() Method

The asSubclass() method of java Class casts this Class object to represent a subclass of the class represented by the specified class object. It throws a ClassCastException if the cast is not valid otherwise it returns a reference to this(current) class object.

Syntax

Parameter

U - Type to cast this class object to

clazz - class of the type to cast this class object to.

Returns

This Class object and cast to represent a subclass of the specified class object).

Throws

ClassCastException

Example 1

import java.lang.*;
public class ClassasSubclassExample1  extends SubClass {
   public static void main(String[] args) {
     try {
         ClassasSubclassExample1 class1 = new ClassasSubclassExample1();
         SubClass subclass = new SubClass(); 

         // class ClassasSubclassExample1
         Class obj = class1.getClass(); 
         System.out.println(obj);

         // sub class SubClass1
         Class obj2 = subclass.getClass();
         System.out.println(obj2);

         Class xy = obj.asSubclass(obj2);

         System.out.println(xy);
      } catch(ClassCastException e) {
         System.out.println(e.toString());
      }
   }
}
class SubClass {
   // sub class
} 

Test it Now

Output:

class ClassasSubclassExample1
class SubClass
class ClassasSubclassExample1

Example 2

package Class;
public class ClassasSubclassExample2 {
         public static void main(String[] args) {
         ClassasSubclassExample2 class1 = new ClassasSubclassExample2();
         SubClass1 subclass = new SubClass1(); 
         Class obj = class1.getClass(); 
         System.out.println(obj);

         // sub class SubClass1
          Class obj2 = subclass.getClass();
         System.out.println(obj2);

         Class xy = obj2.asSubclass(obj);
         System.out.println(xy);
       } 
}
class SubClass1 extends ClassasSubclassExample2 {
     public SubClass1()
     {
         System.out.println("Derived Class Constructor........");
     }
}

Test it Now

Output:

Derived Class Constructor........
class Class.ClassasSubclassExample2
class Class.SubClass1
class Class.SubClass1

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