Kotlin メモ : use

https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.io/use.html

Java public int queryCount(Context context, Uri uri) { final Cursor c = context.getContentResolver() .query(uri, null, null, null, null); if (c == null) { return 0; } final int count = c.getCount(); c.close(); return count; } Kotlin : 自動変換直後 fun queryCount(context: Context, uri: Uri): Int { val c = context.contentResolver .query(uri, null, null, null, null) ?: return 0 val count = c.count c.close() return count } Kotlin : use 使用 fun queryCount(context: Context, uri: Uri): Int { val c = context.contentResolver .query(uri, null, null, null, null) ?: return 0 c.use { return it.count } }