simplified hashCode for nullable arrays (IDEA-144775)

java/java-impl/src/com/intellij/codeInsight/generation/defaultHashCode.vm

@@ -121,6 +121,7 @@ public int hashCode() {
 #macro(addFieldHashCode $field $brace)
 #set($name = $field.accessor)
 #if ($field.notNull)#adjustHashCodeToArrays($field)
+#elseif ($field.array && $java_version > 4)#adjustHashCodeToArrays($field)
   #else
     #if ($brace)(##
     #end

java/java-tests/testData/codeInsight/generateEquals/afterArraysFromJava15.java

@@ -20,9 +20,9 @@ class Test {
     }
 
     public int hashCode() {
-        int result = myOs != null ? Arrays.hashCode(myOs) : 0;
-        result = 31 * result + (myIIs != null ? Arrays.deepHashCode(myIIs) : 0);
-        result = 31 * result + (myIs != null ? Arrays.hashCode(myIs) : 0);
+        int result = Arrays.hashCode(myOs);
+        result = 31 * result + Arrays.deepHashCode(myIIs);
+        result = 31 * result + Arrays.hashCode(myIs);
         return result;
     }
 }

java/java-tests/testData/codeInsight/generateEquals/afterDifferentTypes.java

@@ -50,12 +50,12 @@ class A {
     public int hashCode() {
         int result;
         long temp;
-        result = a1 != null ? Arrays.hashCode(a1) : 0;
-        result = 31 * result + (a2 != null ? Arrays.deepHashCode(a2) : 0);
-        result = 31 * result + (a3 != null ? Arrays.hashCode(a3) : 0);
-        result = 31 * result + (a4 != null ? Arrays.deepHashCode(a4) : 0);
-        result = 31 * result + (a5 != null ? Arrays.hashCode(a5) : 0);
-        result = 31 * result + (a6 != null ? Arrays.deepHashCode(a6) : 0);
+        result = Arrays.hashCode(a1);
+        result = 31 * result + Arrays.deepHashCode(a2);
+        result = 31 * result + Arrays.hashCode(a3);
+        result = 31 * result + Arrays.deepHashCode(a4);
+        result = 31 * result + Arrays.hashCode(a5);
+        result = 31 * result + Arrays.deepHashCode(a6);
         result = 31 * result + (int) a7;
         result = 31 * result + (int) a8;
         result = 31 * result + a9;

java/java-tests/testData/codeInsight/generateEquals/afterDifferentTypesGetters.java

@@ -98,12 +98,12 @@ class A {
     public int hashCode() {
         int result;
         long temp;
-        result = getA1() != null ? Arrays.hashCode(getA1()) : 0;
-        result = 31 * result + (getA2() != null ? Arrays.deepHashCode(getA2()) : 0);
-        result = 31 * result + (getA3() != null ? Arrays.hashCode(getA3()) : 0);
-        result = 31 * result + (getA4() != null ? Arrays.deepHashCode(getA4()) : 0);
-        result = 31 * result + (getA5() != null ? Arrays.hashCode(getA5()) : 0);
-        result = 31 * result + (getA6() != null ? Arrays.deepHashCode(getA6()) : 0);
+        result = Arrays.hashCode(getA1());
+        result = 31 * result + Arrays.deepHashCode(getA2());
+        result = 31 * result + Arrays.hashCode(getA3());
+        result = 31 * result + Arrays.deepHashCode(getA4());
+        result = 31 * result + Arrays.hashCode(getA5());
+        result = 31 * result + Arrays.deepHashCode(getA6());
         result = 31 * result + (int) getA7();
         result = 31 * result + (int) getA8();
         result = 31 * result + getA9();