Calling Java from Kotlin seamlessly - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an instance of the Java class JavaClass in Kotlin.

Kotlin

val javaObj = [1]()

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

AJavaClass

BjavaClass

CJava_Class

Djava_class

Attempts:

3 left

💡 Hint

Common Mistakes

Using lowercase or incorrect class names.

Trying to use Kotlin-specific syntax for Java class instantiation.

In Kotlin, you create an instance of a Java class by calling its constructor just like in Java, using the class name.

2fill in blank

medium

Complete the code to call the Java method getGreeting() from the Kotlin object javaObj.

Kotlin

val message = javaObj.[1]()

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

Agetgreeting

BgetGreeting

Cget_greeting

DGetGreeting

Attempts:

3 left

💡 Hint

Common Mistakes

Changing the case of the method name.

Using underscores instead of camelCase.

Java methods are called in Kotlin using the exact method name with camelCase, matching Java naming conventions.

3fill in blank

hard

Fix the error in calling the Java static method JavaClass.staticMethod() from Kotlin.

Kotlin

val result = JavaClass.[1]()

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Astatic_method

BStaticMethod

CstaticMethod

DStatic_Method

Attempts:

3 left

💡 Hint

Common Mistakes

Changing method name casing.

Trying to call static methods like instance methods.

Static methods in Java are called in Kotlin using the exact method name with correct casing.

4fill in blank

hard

Fill both blanks to create a Kotlin function that calls a Java method calculateSum(int a, int b) and returns the result.

Kotlin

fun sum(a: Int, b: Int): Int = javaObj.[1]([2], b)

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AcalculateSum

Ba

Cb

Dsum

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong method names.

Passing wrong variables as arguments.

Call the Java method by its exact name and pass the Kotlin function parameter a as the first argument.

5fill in blank

hard

Fill all three blanks to create a Kotlin property that calls a Java getter method getName() from javaObj.

Kotlin

val name: String
    get() = javaObj.[1]()

fun printName() {
    println([2])
    println(javaObj.[3]())
}

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

AgetName

Bname

Dgetname

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect casing for method names.

Printing the method call instead of the property.

Use the Java getter method getName() exactly for the property getter and print statements. The property name is name.