tOnClickListener(new void onClick(View v) 7. ? check below example In Java you write click listener code like below. Kotlin natively supports lambdas expression, that simplifies your code and reduces the number of line of the code in Android. data class LoginUser(val userName: String, val email: String) 3. Create a POJO with equals(), getters, setters, hashCode(), and copy(), toString() with a single line like below. Conciseįocus on expressing your ideas and write less boilerplate code you need to write. Println(name.length()) // Compilation error 2. Val name: String? = null // Nullable type (!! operator indicates not nullable,? the operator tells the compiler it can be null) var output: String UserName = null But Kotlin handle this state using !! and ? operator

Normally, In Java you declare like this String userName The Kotlin has eliminated the danger of null references from code throughout the app, write safe code and avoid NullPointerExceptions exception. The interoperable feature makes more easy to use in an existing Java project. Kotlin is easy to learn for an existing developer, especially for Java developer. Kotlin help to make a healthy app and improve performance of the application. Handle immutable of variable threw out the applications. * */ /* * * * */ public fun callsInPlace(lambda: Function, kind: InvocationKind = InvocationKind.It contains safety feature for nullability, Avoid an entire class of null pointer exception. * * A function declaring the `callsInPlace` effect must be _inline_. _(optionally)_ the function is invoked the amount of times specified by the parameter, * see the enum for possible values. the function can only be invoked during the call of the owner function, * and it won't be invoked after that owner function call is completed * 2. ** * Specifies that the function parameter is invoked in place. What conditions it superimposed, we need to check the parameter of the contractĪnd what contract applied in the apply function ? This superimposes some conditions on the lambda we passed as a parameter to the apply function. This is exactly the same contract as to any other scope function.

Kotlin use