Quick Answer

Proper syntax for Java interop

Understanding the Issue

Kotlin treats Java static methods differently than Java instance methods. They appear as members of the companion object in Kotlin or need special syntax.

The Problem

This code demonstrates the issue:

Kotlin Error 
// Problem: Incorrect call
Collections.sort(list) // Error in Kotlin

The Solution

Here's the corrected code:

Kotlin Fixed 
// Solution 1: Use companion syntax
Collections.Sort(list)

// Solution 2: Kotlin alternative
list.sort()

// Solution 3: Import as extension
import java.util.Collections.sort
sort(list)

Key Takeaways

Use companion object syntax or Kotlin alternatives for Java static methods.