How do I resolve Java Lang ClassCastException error?

// type cast an parent type to its child type. In order to deal with ClassCastException be careful that when you’re trying to typecast an object of a class into another class ensure that the new type belongs to one of its parent classes or do not try to typecast a parent object to its child type.

What causes ClassCastException?

ClassCastException is a runtime exception raised in Java when we try to improperly cast a class from one type to another. It’s thrown to indicate that the code has attempted to cast an object to a related class, but of which it is not an instance.

How do you avoid ClassCastException?

To prevent the ClassCastException exception, one should be careful when casting objects to a specific class or interface and ensure that the target type is a child of the source type, and that the actual object is an instance of that type.

Can we typecast parent to child in Java?

In Java, the object can also be typecasted like the datatypes. Parent and Child objects are two types of objects. So, there are two types of typecasting possible for an object, i.e., Parent to Child and Child to Parent or can say Upcasting and Downcasting. In Java, the object can also be typecasted like the datatypes.

What is ClassCastException in Java with example?

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. So, for example, when one tries to cast an Integer to a String , String is not an subclass of Integer , so a ClassCastException will be thrown. Object i = Integer.

How would you explain a ClassCastException in Java?

ClassCast Exception in Java is one of the unchecked exceptions that occur when we try to convert one class type object into another class type. ClassCast Exception is thrown when we try to cast an object of the parent class to the child class object.

What is casting in Java?

Type casting is when you assign a value of one primitive data type to another type. In Java, there are two types of casting: Widening Casting (automatically) – converting a smaller type to a larger type size. byte -> short -> char -> int -> long -> float -> double.

What is Upcasting and down casting?

Upcasting (Generalization or Widening) is casting to a parent type in simple words casting individual type to one common type is called upcasting while downcasting (specialization or narrowing) is casting to a child type or casting common type to individual type.

What does ClassCastException mean?

Class ClassCastException Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance. For example, the following code generates a ClassCastException : Object x = new Integer(0); System.

How do you cast a class?

Class cast() method in Java with Examples The method returns the object after casting in the form of an object. Return Value: This method returns the specified object after casting in the form of an object. Exception: This method throws: ClassCastException: if the object is not null and is not assignable to the type T.

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