abreslav

annotation class A

fun main(args: Array<String>) {
    val f = @A {}

    f.javaClass.methods.filter { it.name == "invoke" && it.parameterTypes.isEmpty() }.forEach {
        it.annotations.forEach(::println)
        println(it)
        println()
    }

abreslav

public class SomeAdapter(val friends: SomeAdapterProvider, val listener: OnItemClickedListener) : RecyclerView.Adapter<SomeAdapter.ViewHolder>() {

trait OnItemClickedListener {
    fun onItemClicked(f: Friendship)
}

private inner class ViewHolder(v: View) : RecyclerView.ViewHolder(v), View.OnClickListener {
    override fun onClick(v: View) {
        listener.onItemClicked(somethings[getPosition()])
    }

abreslav

1. CallbackFunction.kt#L87
2. GeneratorTarget.kt#L287
3. BaseRepositoryManager.kt#L199
4. Handlers.kt#L35
5. NonBlockingHandlers.kt#L90
6. LayoutServletFilter.kt#L20

abreslav

    class Ratio(num : Int, denom : Int) {
     val numerator: Int
     val denominator: Int
    
     {
        val theGcd = gcd(num, denom)
        numerator = num / theGcd
        denominator = denom / theGcd
      }
    }

abreslav

Calling a class object member from Java:

public class Engine private() {
    class object {
        public fun getInstance(): Engine = Engine()
    }
}

abreslav

Kotlin (Programming Language)

Kotlin is a modern statically typed programming language targeting the Java and JavaScript platforms. It is conceived as a "modern language for industry", keeping a balance between flexibility and readability, expressiveness and safety.

Project Overview

A modern programming language is much more than a grammar. Principal susystems of Kotlin include

• Compiler front-end
• Lexer/Parser translates text into a syntax tree, reports syntax errors

abreslav

// Why do we need variance

// Invariant class List, just like in Java
class List<T> { /* normal list */ }

fun printContents(list: List<Any>) {
    for (item in list) {
        println(item)
    }
}

abreslav

Red node isn't marked as red: Red node isn't marked as red
java.lang.AssertionError: Red node isn't marked as red
	at com.intellij.vcs.log.data.VcsLogJoiner$RedGreenSorter.markRealRedNode(VcsLogJoiner.java:175)
	at com.intellij.vcs.log.data.VcsLogJoiner$RedGreenSorter.getFirstSaveIndex(VcsLogJoiner.java:191)
	at com.intellij.vcs.log.data.VcsLogJoiner$RedGreenSorter.access$300(VcsLogJoiner.java:161)
	at com.intellij.vcs.log.data.VcsLogJoiner.getRedCommitsAndSavedRedIndex(VcsLogJoiner.java:154)
	at com.intellij.vcs.log.data.VcsLogJoiner.addCommits(VcsLogJoiner.java:53)
	at com.intellij.vcs.log.data.VcsLogDataHolder.smartRefresh(VcsLogDataHolder.java:385)
	at com.intellij.vcs.log.data.VcsLogDataHolder.access$2400(VcsLogDataHolder.java:88)
	at com.intellij.vcs.log.data.VcsLogDataHolder$12.consume(VcsLogDataHolder.java:668)

abreslav

Ref should exist for this node. Hash: 603812
java.lang.Throwable
	at com.intellij.openapi.diagnostic.Logger.error(Logger.java:113)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.createBranch(GraphBuilder.java:123)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.addCurrentCommitAndFinishRow(GraphBuilder.java:107)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.append(GraphBuilder.java:165)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.runBuild(GraphBuilder.java:198)
	at com.intellij.vcs.log.graph.mutable.GraphBuilder.build(GraphBuilder.java:29)
	at com.intellij.vcs.log.data.DataPack.build(DataPack.java:43)
	at com.intellij.vcs.log.data.VcsLogDataHolder.smartRefresh(VcsLogDataHolder.java:404)

abreslav

class Bar {
    fun invoke(x: Int): Int = x
}
class Foo {
    val get: Bar = Bar()
}



fun foo () {