Fruit Salad

Ingredients
1 can (20 oz) pineapple chunks in its own juice. (Do not drain the juice.)
1 can ( 15 oz) mandarin oranges (drained)
1 bunch (¾ lb,) purple grapes (cut in half)
3 bananas (peeled and sliced)
1 package (16 oz) blackberries
1 small box vanilla instant pudding