Supported simplest cases of SAM adapter in backend.

compiler/testData/codegen/boxWithJava/samAdapters/comparator.java

@@ -0,0 +1,7 @@
+import java.util.*;
+
+class JavaClass {
+    public static void sortIntList(List<Integer> list, Comparator<Integer> comparator) {
+        Collections.sort(list, comparator);
+    }
+}

compiler/testData/codegen/boxWithJava/samAdapters/comparator.kt

@@ -0,0 +1,8 @@
+import java.util.*
+
+fun box(): String {
+    val list = ArrayList(Arrays.asList(3, 2, 4, 8, 1, 5))
+    val expected = ArrayList(Arrays.asList(8, 5, 4, 3, 2, 1))
+    JavaClass.sortIntList(list, { a, b -> b - a })
+    return if (list == expected) "OK" else list.toString()
+}

compiler/testData/codegen/boxWithJava/samAdapters/fileFilter.java

@@ -0,0 +1,7 @@
+import java.io.*;
+
+class JavaClass {
+    public static String invokeFilter(FileFilter f, File file1, File file2) {
+        return f.accept(file1) + " " + f.accept(file2);
+    }
+}

compiler/testData/codegen/boxWithJava/samAdapters/fileFilter.kt

@@ -0,0 +1,11 @@
+import java.io.*
+
+fun box(): String {
+    val ACCEPT_NAME = "test"
+    val WRONG_NAME = "wrong"
+
+    val result = JavaClass.invokeFilter({ file -> ACCEPT_NAME == file?.getName() }, File(ACCEPT_NAME), File(WRONG_NAME))
+
+    if (result != "true false") return "Wrong result: $result"
+    return "OK"
+}

compiler/testData/codegen/boxWithJava/samAdapters/simplest.java

@@ -0,0 +1,5 @@
+class JavaClass {
+    public static void run(Runnable r) {
+        r.run();
+    }
+}

compiler/testData/codegen/boxWithJava/samAdapters/simplest.kt

@@ -0,0 +1,5 @@
+fun box(): String {
+    var v = "FAIL"
+    JavaClass.run { v = "OK" }
+    return v
+}