TOKYO (AP) - The Bank of Japan says business sentiment among major manufacturers has turned positive for the first time in nearly two years. The central bank's closely-watched quarterly "tankan" survey for June showed Monday that the index for major manufacturers rose to positive 4 from negative 8 in March. It was the first survey to be higher than zero since September 2011. A positive reading means more companies are optimistic than pessimistic. The index for major non-manufacturers rose to 12 from 6 in the last survey. The improvement comes amid a weakening yen, which boosts overseas income for Japan's key exporters, and a series of aggressive economic policies - moentary easing and boosting public workers projects - by Prime Minister Shinzo Abe since he took office in December.