Error handling patterns in Android Kotlin - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to catch an exception in Kotlin.

Android Kotlin

try {
    val result = 10 / 0
} catch (e: [1]) {
    println("Error occurred")
}

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AString

BBoolean

CInt

DException

Attempts:

3 left

💡 Hint

Common Mistakes

Using non-exception types like String or Int in catch.

The Exception class is used to catch errors in Kotlin.

2fill in blank

medium

Complete the code to throw an exception when a condition is false.

Android Kotlin

fun checkAge(age: Int) {
    if (age < 18) {
        throw [1]("Age must be 18 or older")
    }
}

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AIllegalArgumentException

BNullPointerException

CArrayIndexOutOfBoundsException

DIOException

Attempts:

3 left

💡 Hint

Common Mistakes

Using unrelated exceptions like IOException for argument checks.

IllegalArgumentException is used to indicate that a method has been passed an illegal or inappropriate argument.

3fill in blank

hard

Fix the error in the code to properly handle a nullable value with try-catch.

Android Kotlin

fun parseNumber(str: String?): Int {
    return try {
        str?.toInt() ?: throw [1]("Null string")
    } catch (e: NumberFormatException) {
        0
    }
}

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AIOException

BIllegalArgumentException

CNullPointerException

DArithmeticException

Attempts:

3 left

💡 Hint

Common Mistakes

Throwing unrelated exceptions like IOException for null checks.

NullPointerException is appropriate to throw when a null value is unexpected.

4fill in blank

hard

Fill both blanks to create a try-catch block that logs the error message.

Android Kotlin

try {
    val data = fetchData()
} catch (e: [1]) {
    Log.e("Error", e.[2])
}

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AException

Bmessage

Ccause

DstackTrace

Attempts:

3 left

💡 Hint

Common Mistakes

Using cause or stackTrace instead of message for error text.

Catch Exception to handle errors, and use message to get the error description.

5fill in blank

hard

Fill all three blanks to define a custom exception class and throw it.

Android Kotlin

class [1](message: String) : [2](message)

fun test() {
    throw [3]("Custom error")
}

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AMyException

BException

DThrowable

Attempts:

3 left

💡 Hint

Common Mistakes

Using Throwable directly or mismatching class names.

Define a custom exception MyException that inherits from Exception and throw it.