ClassCastException in Java

java.lang.ClassCastException

Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.

Implemented Interfaces:

Serializable

Declaration

public class ClassCastException extends RuntimeException {
            @java.io.Serial
            private static final long serialVersionUID = 
                              -9223365651070458532L;

            public ClassCastException() {
                super();
            }

            public ClassCastException(String s) {
                super(s);
            }
}

Methods

1. ClassCastException()

java.lang.ClassCastException.ClassCastException()

Constructs a ClassCastException with no detailed message.

Approach

Java

public class ClassCastException1 {
    public static void main(String[] args) {
        ClassCastException castException = 
                       new ClassCastException();

        System.out.println(castException);

    }
}

Output:

java.lang.ClassCastException

2. ClassCastException(String s)

java.lang.ClassCastException.ClassCastException(String s)

Constructs a ClassCastException with the specified detail message.

Parameters: s the detailed message.

Approach

Java

public class ClassCastException2 {
    public static void main(String[] args) {
        String s = "HELLO";
        ClassCastException castException = 
                      new ClassCastException(s);

        System.out.println(castException);
    }
}

Output:

java.lang.ClassCastException: HELLO

Example

Java

package com.ClassCastException;

public class ClassCastExceptionExample {
    public static void main(String[] args) {
        Object x = 100;
        System.out.println((String) x);
    }
}

Output:

Exception in thread "main" java.lang.ClassCastException: class java.lang.Integer cannot be cast to class java.lang.String (java.lang.Integer and java.lang.String are in module java.base of loader 'bootstrap')
	at com.ClassCastException.ClassCastExceptionExample.main(ClassCastExceptionExample.java:6)

Some other Errors/Exceptions

AbstractMethodError: Thrown when an application tries to call an abstract method.

ArithmeticException: Thrown when an exceptional arithmetic condition has occurred.

ArrayIndexOutOfBoundsException: Thrown to indicate that an array has been accessed with an illegal index.

ArrayStoreException: Thrown to indicate that an attempt has been made to store the wrong type of object into an array of objects.

AssertionError: Thrown to indicate that an assertion has failed.

BootstrapMethodError: Thrown to indicate that an invoke dynamic instruction or a dynamic constant failed to resolve its bootstrap method and arguments, or invoke dynamic instruction the bootstrap method has failed to provide a call site with a target of the correct method type, or for a dynamic constant, the bootstrap method has failed to provide a constant value of the required type.

ClassCastException: Thrown to indicate that the code has attempted to cast an object to a subclass of which it is not an instance.

ClassCircularityError: Thrown when the Java Virtual Machine detects a circularity in the superclass hierarchy of a class is loaded.

ClassFormatError: Thrown when the Java Virtual Machine attempts to read a class file and determines that the file is malformed or otherwise cannot be interpreted as a class file.

ClassNotFoundException: Thrown when an application tries to load in a class through its string name using: The forName method in class Class. The findSystemClass method in class ClassLoader. The loadClass method in class ClassLoader.

CloneNotSupportedException: Thrown to indicate that the clone method in class Object has been called to clone an object, but the object's class does not implement the Cloneable interface.

Error: An Error is a subclass of Throwable that indicates serious problems that a reasonable application should not try to catch.

Exception: The class Exception and its subclasses are a form of Throwable that indicates conditions that a reasonable application might want to catch.

ExceptionInInitializerError: Signals that an unexpected exception has occurred in a static initializer.

IllegalAccessError: Thrown if an application attempts to access or modify a field, or to call a method that it does not have access to.

IllegalAccessException: An IllegalAccessException is thrown when an application tries to reflectively create an instance (other than an array), set or get a field, or invoke a method, but the currently executing method does not have access to the definition of the specified class, field, method or constructor.

IllegalArgumentException: Thrown to indicate that a method has been passed an illegal or inappropriate argument.

IllegalCallerException: Thrown to indicate that a method has been called by an inappropriate caller.

IllegalMonitorStateException: Thrown to indicate that a thread has attempted to wait on an object's monitor or to notify other threads waiting on an object monitor without owning the specified monitor.

IllegalStateException: Signals that a method has been invoked at an illegal or inappropriate time.