Java.lang.Class.cast() Method

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Description

The java.lang.Class.cast() method casts an object to the class or interface represented by this Class object.

Declaration

Following is the declaration for java.lang.Class.cast() method

public T cast(Object obj)

Parameters

obj − This is the object to be cast.

Return Value

This method returns the object after casting, or null if obj is null.

Exception

ClassCastException − if the object is not null and is not assignable to the type T.

Example

The following example shows the usage of java.lang.Class.cast() method.

package com.tutorialspoint;

import java.lang.*;

class A {
   public static void show() {
      System.out.println("Class A show() function");
   }
}

class B extends A {
   public static void show() {
      System.out.println("Class B show() function");
   }
}

public class ClassDemo {

   public static void main(String[] args) {

      ClassDemo cls = new ClassDemo();
      Class c = cls.getClass();      
      System.out.println(c);  

      Object obj = new A();        
      B b1 = new B();
      b1.show();

      // casts object
      Object a = A.class.cast(b1);

      System.out.println(obj.getClass());
      System.out.println(b1.getClass());
      System.out.println(a.getClass());               
   }
} 

Let us compile and run the above program, this will produce the following result −

class com.tutorialspoint.ClassDemo
Class B show() function
class com.tutorialspoint.A
class com.tutorialspoint.B
class com.tutorialspoint.B