Fixed KT-5276 J2K: Convert calls to getClass() to javaClass property access

#KT-5276 Fixed

j2k/src/org/jetbrains/jet/j2k/visitors/SpecialMethod.kt

@@ -24,6 +24,9 @@ import org.jetbrains.jet.j2k.ast.Expression
 import org.jetbrains.jet.j2k.ast.MethodCallExpression
 import com.intellij.psi.CommonClassNames.JAVA_LANG_OBJECT
 import com.intellij.psi.PsiSuperExpression
+import org.jetbrains.jet.j2k.ast.QualifiedExpression
+import org.jetbrains.jet.j2k.ast.Identifier
+import org.jetbrains.jet.j2k.ast.assignNoPrototype
 
 enum class SpecialMethod(val qualifiedClassName: String?, val methodName: String, val parameterCount: Int) {
     OBJECT_EQUALS: SpecialMethod(null, "equals", 1) {
@@ -36,6 +39,13 @@ enum class SpecialMethod(val qualifiedClassName: String?, val methodName: String
         }
     }
 
+    OBJECT_GET_CLASS: SpecialMethod("java.lang.Object", "getClass", 0) {
+        override fun convertCall(qualifier: PsiExpression?, arguments: Array<PsiExpression>, converter: Converter): Expression {
+            val identifier = Identifier("javaClass", false).assignNoPrototype()
+            return if (qualifier != null) QualifiedExpression(converter.convertExpression(qualifier), identifier) else identifier
+        }
+    }
+
     OBJECTS_EQUALS: SpecialMethod("java.util.Objects", "equals", 2) {
         override fun convertCall(qualifier: PsiExpression?, arguments: Array<PsiExpression>, converter: Converter)
                 = BinaryExpression(converter.convertExpression(arguments[0]), converter.convertExpression(arguments[1]), "==")

j2k/tests/test/org/jetbrains/jet/j2k/test/JavaToKotlinConverterTestGenerated.java

@@ -2095,6 +2095,11 @@ public class JavaToKotlinConverterTestGenerated extends AbstractJavaToKotlinConv
             doTest("j2k/tests/testData/ast/methodCallExpression/genericMethod.java");
         }
         
+        @TestMetadata("getClass.java")
+        public void testGetClass() throws Exception {
+            doTest("j2k/tests/testData/ast/methodCallExpression/getClass.java");
+        }
+        
         @TestMetadata("simpleCall.java")
         public void testSimpleCall() throws Exception {
             doTest("j2k/tests/testData/ast/methodCallExpression/simpleCall.java");

j2k/tests/testData/ast/methodCallExpression/getClass.java

@@ -0,0 +1,6 @@
+class A {
+    void foo(Object o) {
+        System.out.println(o.getClass());
+        System.out.println(getClass());
+    }
+}

j2k/tests/testData/ast/methodCallExpression/getClass.kt

@@ -0,0 +1,6 @@
+class A {
+    fun foo(o: Any) {
+        System.out.println(o.javaClass)
+        System.out.println(javaClass)
+    }
+}