How to Convert a Kotlin Array to Java Varargs

How can I convert my Kotlin Array to a varargs Java String[]?

val angularRoutings = arrayOf<String>('/language', '/home')

// Usage Example
web.ignoring().antMatchers(*angularRoutings)

In Kotlin, converting an array to Java varargs can be achieved easily using the spread operator (*). This allows you to pass the elements of an array as individual arguments to a method that accepts varargs. In this detailed explanation, we will walk through the process of converting a Kotlin array to a Java varargs parameter and discuss any potential pitfalls.

val angularRoutings = arrayOf<String>('/language', '/home')

// Passing the array to a method that requires varargs
web.ignoring().antMatchers(*angularRoutings)

Causes

• Understanding the difference between array and varargs in Java.
• Using the spread operator incorrectly.

Solutions

• Use the spread operator (*) to unpack the array into varargs.
• Ensure the method signature in Java is compatible with the types provided.

Mistake: Not using the spread operator (*) when passing the array to the method.

Solution: Always use the spread operator (*) to unpack the Kotlin array into varargs.

Mistake: Mismatching the array type with the method parameter type in Java.

Solution: Ensure the data types match; for example, if the method requires String[], the array should be of type String.