src/java.base/share/classes/java/lang/String.java

*** 1449,1463 ****
       *
       * @return  a hash code value for this object.
       */
      public int hashCode() {
          int h = hash;
!         if (h == 0 && value.length > 0) {
!             char val[] = value;
! 
!             for (int i = 0; i < value.length; i++) {
!                 h = 31 * h + val[i];
              }
              hash = h;
          }
          return h;
      }
--- 1449,1461 ----
       *
       * @return  a hash code value for this object.
       */
      public int hashCode() {
          int h = hash;
!         if (h == 0) {
!             for (int v : value) {
!                 h = 31 * h + v;
              }
              hash = h;
          }
          return h;
      }