Creating custom exception class in Java - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a custom exception class named MyException.

Java

public class MyException extends [1] {
}

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AException

BString

CError

DObject

Attempts:

3 left

💡 Hint

Common Mistakes

Extending String or Object instead of Exception.

Extending Error which is for serious JVM errors.

The custom exception class should extend the built-in Exception class to be a checked exception.

2fill in blank

medium

Complete the constructor to pass the error message to the superclass.

Java

public class MyException extends Exception {
    public MyException([1] message) {
        super(message);
    }
}

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AString

Bint

Cboolean

Ddouble

Attempts:

3 left

💡 Hint

Common Mistakes

Using int or boolean instead of String for the message parameter.

The constructor takes a String message and passes it to the superclass constructor.

3fill in blank

hard

Fix the error in the constructor to correctly call the superclass constructor.

Java

public class MyException extends Exception {
    public MyException(String message) {
        [1](message);
    }
}

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Athis

BMyException

Csuper

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' instead of 'super' to call the parent constructor.

Calling the class name as a method.

The constructor must call super(message) to pass the message to the parent Exception class.

4fill in blank

hard

Fill both blanks to add a no-argument constructor that calls the superclass constructor with a default message.

Java

public class MyException extends Exception {
    public MyException() {
        [1]("[2] error occurred");
    }
}

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Asuper

Bthis

CCustom

DDefault

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'this' instead of 'super' in the constructor.

Using an unclear or incorrect default message.

The no-argument constructor calls super with a default message string.

5fill in blank

hard

Fill all three blanks to add a constructor that accepts a message and a cause, passing both to the superclass.

Java

public class MyException extends Exception {
    public MyException([1] message, [2] cause) {
        [3](message, cause);
    }
}

Drag options to blanks, or click blank then click option'

AString

BThrowable

Csuper

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong types for message or cause.

Not calling the superclass constructor properly.

The constructor takes a String message and a Throwable cause, then calls super(message, cause).