This is usually not a problem with whole fresh or frozen fruit, because the water and fiber content of whole fruit makes the fruit very voluminous for the calorie content (though not as voluminous as leafy vegetables and such). Avocados and olives are somewhat higher in calorie density, due to high fat content (but the fat is good fat if you do not go over calorie budget).
However, fruit juices are not so good, since drinking them makes it easy to take in a lot more sugar calories than eating fruit lets you. Also, juices do not have the fiber content of the fruit.
Dried fruit, while it contains the fiber, is also easy to eat a lot of calories of. Also, some dried fruit has added sugar, oil, or other undesirable things, so check the label carefully if you did not dry it yourself.