J2K: convert hex Java literal to hex Kotlin literal

j2k/src/org/jetbrains/kotlin/j2k/ExpressionConverter.kt

@@ -297,8 +297,18 @@ class DefaultExpressionConverter : JavaElementVisitor(), ExpressionConverter {
                 text = text.replace("l", "L")
             }
 
+            fun isHexLiteral(text: String) = text.startsWith("0x") || text.startsWith("0X")
+            fun isLongField(element: PsiElement): Boolean {
+                val fieldType = (element as? PsiVariable)?.type ?: return false
+                return when (fieldType) {
+                    is PsiPrimitiveType -> fieldType.canonicalText == "long"
+                    else -> PsiPrimitiveType.getUnboxedType(fieldType)?.canonicalText == "long"
+                }
+            }
+
             if (typeStr == "int") {
-                text = if (value != null) value.toString() else text
+                val toIntIsNeeded = value != null && value.toString().toInt() < 0 && !isLongField(expression.parent)
+                text = if (value != null && !isHexLiteral(text)) value.toString() else text + (if (toIntIsNeeded) ".toInt()" else "")
             }
         }
 

j2k/testData/fileOrElement/literalExpression/hex.java

@@ -3,5 +3,11 @@ class Test {
   void test() {
     int i1 = 0x21;
     Int i2 = 0x33;
+    int i3 = 0xffffffff;
+    int i4 = 0XCCCC;
+    int i5 = 0x6fffffff;
+    long l1 = 0xffffffff;
+    Long l2 = 0xffffffffl;
+    long l3 = 0xffffffffffL;
   }
 }

j2k/testData/fileOrElement/literalExpression/hex.kt

@@ -1,6 +1,12 @@
 internal class Test {
     fun test() {
-        val i1 = 33
-        val i2 = 51
+        val i1 = 0x21
+        val i2 = 0x33
+        val i3 = 0xffffffff.toInt()
+        val i4 = 0XCCCC
+        val i5 = 0x6fffffff
+        val l1: Long = 0xffffffff
+        val l2 = 0xffffffffL
+        val l3 = 0xffffffffffL
     }
 }